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Mezuzah: Difference between revisions

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==How the Mezuzah Should Be Placed==
==How the Mezuzah Should Be Placed==
===Height===
#The mezuzah should be placed at the beginning of the upper third of the height of the doorway<ref>Kitzur Shulchan Aruch 11:5, Rashi Menachot 33a s.v. “bitechila,” Rambam Hilchot Mezuzah 6:12, Tur 289, Prisha 289:6, Shulchan Aruch 289:2, Levush 289:2, Chayei Adam 15:17, Pitchei Mezuzahs 289:24, Chovat Hadar 8:2:4, Teshuvot Vihanhagot 2:539. See Yabia Omer YD 2:21 where Chacham Ovadia Yosef quotes poskim who say that if it was placed higher than the beginning of the top third it should be moved without a beracha to there, but himself disagrees. </ref> but it should be placed at least a [[Tefach]] from the top of the doorway. <ref>Tur 289, Shulchan Aruch 289:2, Levush 289:2, Kitzur Shulchan Aruch 11:5 </ref> If it is not in the top third it isn't kosher. <ref>Beit Yosef 289, Shach 289:4, Taz 289:3. </ref> If it isn't a tefach from the top of the door it should be fixed.<ref>Mezuzah Vehilchoteha 11:8 quotes Halichot Olam v. 8 p. 251 who writes that according to Shulchan Aruch if the mezuzah is within a tefach of the ceiling it needs to be fixed. He says that it is in disagreement with the Ben Ish Chai Ki Tavo n. 7 who writes that after the fact it is kosher.</ref>
====Very Tall Doorways====
#If a doorway is very tall, according to Ashkenazim, one should put up the mezuzah at shoulder height.<ref>Yerushalmi Megillah 4:12, Tosfot Yoma 11b s.v. shein, Shach 289:4</ref> However, according to Sephardim, one should place it in the upper third in all circumstances.<ref>Yalkut Yosef YD 285:77</ref>
====Arched Doorway====
#If the doorway is arched there is a dispute whether the height of the doorposts includes the arched section where the doorway has a width of 4 tefachim. Therefore, if there is a small area which is arched and the doorway has a width of greater than 4 tefachim, it is possible to satisfy both opinions by placing it on the vertical section of the door but still within the top third of the doorway.<ref>Chovat Hadar (p. 59, n. 35)</ref> (For example, if a doorway is 90 inches and the top 12 inches are arched and still has a width of tefachim, one should place the mezuzah in the vertical section above 60 inches.<ref>According to the opinion that the arched section is included the mezuzah should be placed at 60 inches (2/3 of 90) and above and according to the opinion that the arched section isn't included the mezuzah should be placed at 52 inches (2/3 of 78) and above. To satisfy both opinions one can place it at 60 inches where the doorpost is still vertical. </ref>)
#If the height of the arch is more than one third of the height of the entire doorway so that it isn't possible to satisfy both opinions the primary opinion is to place the mezuzah two thirds up the vertical part of the doorway excluding the arch.<ref>Chovat Hadar p. 60 n. 35 writes that the Taz 287:2 in such a case says to place the mezuzah in the arched part like Rashi. He explains that even Rambam could agree since anyway there is a vertical doorway that is 10 tefachim. Chovat Hadar quotes achronim who disagree and side with Rambam. Shulchan Aruch YD 287:2 holds like the Rambam. More details about [https://www.vaadmhk.org/mezuzah-archway/ how to affix a mezuzah on an archway].</ref>
====Posts that Don't Reach the Ceiling====
[[Image:Short Doorposts.png|right|200px]]
#If there are doorposts which are ten tefachim but they don't reach the ceiling and there is a wall which reaches the ceiling the mezuzah should be placed on the doorposts and not the wall (spot ב in the picture).<ref>Derech Hachaim 240:8, Pitchei Teshuva 286:10, Kitzur Shulchan Aruch 11:12, Chovat Hadar 8:2:2, Agur Bohalecha 22:24, [https://www.yutorah.org/lectures/lecture.cfm/1037727/Rabbi%20Mordechai%20I.%20Willig/Mezuzah%20Shiur%2028%20-%20Elevators,%20Accordion%20Doors,%20Garages,%20Hospitals Rav Mordechai Willig (Mezuzah Shiur 28 min 22)].
*Derech Hachayim 240:8 writes that if a doorpost doesn't reach the ceiling the mezuzah should be placed on that doorpost as long as it is ten tefachim tall. The Mikdash Me'at 286:36 establishes the case of the Derech Hachaim to only when the door reaches within a third of the entire doorway. However, the Keviyut Mezuzah Khilchata p. 389 points out that this Mikdash Me'at is a very difficult explanation of the Derech Hachaim. He agrees with the Derech Hachaim. Also, Chovat Hadar 8:2:2 p. 73 writes that if there are doorposts which are ten tefachim they are considered the right place for the mezuzah even though they do not reach the ceiling and there is a wall which does reach the ceiling. Sechel Tov 289:73 quotes others who agree with the Chovat Hadar. However, [http://www.yutorah.org/sidebar/lecture.cfm/839765/rabbi-baruch-simon/%D7%91%D7%A2%D7%A0%D7%99%D7%9F-%D7%9E%D7%A7%D7%95%D7%9D-%D7%A7%D7%91%D7%99%D7%A2%D7%AA-%D7%94%D7%9E%D7%96%D7%95%D7%96%D7%94/ Rabbi Simon] discusses this case at length and comes to the conclusion that it should be placed on the wall if the doorposts aren't shoulder height (spot א in the picture).
*In theory, Keviyut Mezuzah Khilchata 9:4 writes that there's two reasons why such a doorway would require a mezuzah. 1) The ten tefach posts are viewed as though they are extended up to the ceiling based on '''gud asik''' (Meiri Eruvin 11b, Sh"t Rav Eliyahu Mizrachi 2:26). 2) The posts don't need to touch the roof (Chesed Lavraham 16, Chazon Ish 170:3). Seemingly according to the first approach the mezuzah would be placed a third of the way to the ceiling, whereas the second approach would say to put it a third of the way up the post itself. He points out that another factor to consider is whether the mezuzah needs to be within a third of the height of the post or the doorway.</ref>
===In the Doorframe===
<center><gallery>
Exterior mezuzah.png|Picture #1: Mezuzah on wall in front of door within tefach
Door inward.png|Picture #2: Inward swinging door with mezuzah behind door within frame
Inner post.png|Picture #3: Blue mezuzah on thicker post and gold on thinner post
</gallery></center>
#The mezuzah is placed on the right side of the doorframe underneath the lintel within a tefach of the outside of the doorframe.<ref>Shulchan Aruch Y.D. 289:1</ref> The mezuzah must be placed so that it is visible or there is a symbol to indicate that there is a mezuzah.<ref>[https://hebrewbooks.org/pdfpager.aspx?req=14428&pgnum=53 Yad Haketana (ch. 3 fnt. 25)] explains that it is critical to the mezuzah that a person be able to see the mezuzah and thinking about Hashem. If it is inserted into the post there must be a symbol engraved on the outside of the post to indicate that there is a mezuzah there.</ref>
#If there is no place to put the mezuzah within the doorframe (picture #1), according to Ashkenazim the mezuzah can be placed on the area in front of the doorframe within a tefach of the doorframe.<ref>According to the Shach's understanding the Rama 289:1 rules like the Tur that after the fact a mezuzah is kosher if it is behind the door outside of the doorframe. Agur Bohalecha siman 44-46 discusses at length whether having the mezuzah in front of the doorframe is the equivalent of behind the doorframe or better. Either way, in a case where it is impossible to put it in the doorframe it is best to put it in front of the doorframe.</ref> According to Sephardim it must be placed within the doorframe in front of the door or behind the door (picture #2).<ref>Shulchan Aruch, Yalkut Yosef (Sova Semachot v. 1 "Makom Hamezuza" n. 70). Yalkut Yosef clarifies that having the mezuzah within the doorframe behind the door is also called in the doorway and kosher for Shulchan Aruch. Agur Bohalecha siman 43 agrees.</ref>
#If a doorpost has a thicker post and a thinner post which is further towards the outside (picture #3), the mezuzah can be placed on the thinner part (gold mezuzah in picture).<ref>Agur Bohalecha 13:6</ref> Some hold it should be placed specifically on the thicker part (blue mezuzah in picture).<ref>Chovat Hadar 8:3:1 fnt. 3 explaining the position of Rav Dovid Yungreis</ref>
#The mezuzah should not be placed behind the door on the wall next to the doorframe. If it is, according to many poskim, the mezuzah is invalid.<ref>Shulchan Aruch Y.D. 289:1 holds that it is invalid. Shach 291:3 explains while the Tur and Rama hold it is valid after the fact, the Bet Yosef and Levush hold otherwise. He is strict for the Bet Yosef. Nishmat Adam 15:1 shows that most rishonim hold it is valid and in extenuating circumstances it is permitted to place it there without a bracha.</ref>
===Outer Tefach===
===Outer Tefach===


#The mezuzah should be placed on the outer [[tefach]] of the doorpost. <ref>Gemara Menachot 32b, Tur 289, Shulchan Aruch 289:2, Levush 289:2, Chayei Adam 15:17, Aruch Hashulchan 289:9. Taz 289:3 writes that the mezuzah is still kosher if the mezuzah isn't on the outer [[tefach]]. </ref>
#The mezuzah should be placed on the outer [[tefach]] of the doorpost. <ref>Gemara Menachot 32b, Tur 289, Shulchan Aruch 289:2, Levush 289:2, Chayei Adam 15:17, Aruch Hashulchan 289:9. Taz 289:3 writes that the mezuzah is still kosher if the mezuzah isn't on the outer [[tefach]]. </ref>
#If it can't be placed on the doorpost, it should be drilled into the doorpost. If it can not be drilled into the doorpost it should be attached to the wall within one [[tefach]] of the doorway. It should be on the outside wall as one enters the room and not the inside wall.<ref>The Complete Mezuzah Guide p. 74 by R' Elefant based on Shulchan Aruch Y.D. 289:4</ref>
#If it can't be placed on the doorpost, it should be drilled into the doorpost. If it can not be drilled into the doorpost it should be attached to the wall within one [[tefach]] of the doorway. It should be on the outside wall as one enters the room and not the inside wall.<ref>The Complete Mezuzah Guide p. 74 by R' Elefant based on Shulchan Aruch Y.D. 289:4</ref>
===Fixed to the Doorpost===
#A mezuzah should be established in a sturdy way so that it won't fall down. Also, it should not be hanging.<ref>Shulchan Aruch Y.D. 289:1. Bach understands the reason that the halacha insists that a mezuzah should be put up with nails is so that it doesn't fall down. One should establish it in a way that even in the unlikely scenario it won't fall down. The Chayei Adam 15:19 implies that the reason that it should be put up with two nails is because if one only uses one mezuzah on top, the mezuzah is like it is hanging and the mezuzah should not be hanging. </ref>
#A mezuzah could be put up with nails, one on top and one on bottom, but not with just one nail.<ref>Shulchan Aruch Y.D. 289:1, Chayei Adam 15:19</ref> If one put it up with only one nail but it was tightly fastened to the wall and doesn't move it is valid.<ref>Agur Bohalecha 10:3</ref>
#A mezuzah could be put up with tape or glue.<ref>Agur Bohalecha 10:4. Rav Chaim Kanievsky in Daat Noteh p. 472 writes that initially one should not put up a mezuzah with glue.</ref>
#Some say that a mezuzah could be put up with Velcro.<ref>Agur Bohalecha 10 quoting Rav Elyashiv</ref>
#Some say that a mezuzah shouldn't be put up with a magnet.<ref>Rav Chaim Kanievsky in Daat Noteh p. 472</ref>
#The minhag is to put the mezuzah in a case.<ref>Maaseh Rav n. 98 cites the practice of the Gra to place the mezuzah directly onto the post with no case specifically so that there’s no intoposition between the mezuzah and the post. Pitchei Teshuva 289:2 quotes this but questions it. However, Aruch Hashulchan 289:19 and Yabia Omer YD 8:29 strongly disagree with this citation and think that the Gra never said it. Agur Bohalecha (ch. 9 fnt. 3) writes that the minhag is not concerned for this citation of the Gra and it isn’t recommended since it will make the mezuzot invalid much more quickly. He also records the practice of Brisk to follow this citation of the Gra.</ref>
===Straight or Diagonal===
#While Sephardim place the mezuzah straight up<ref>Rashi Menachot 33a s.v. pesula, Shulchan Aruch Y.D. 289:6, Ben Ish Chai Ki Tavo Year 2 Halacha 7. This was also the minhag of the Gr"a (Biurei Hagra 289:14 and Maaseh Rav n. 97). Also see Orchos Rabbeinu 1:page 378:27 who quotes that the Chazon Ish and Steipler put their mezuzot on a small slant because if it would be on a diagonal one doesn't fulfill the opinion of Rashi or Tosfot. Rav Chaim Kanievsky in Mezuzot Beytecha (Shaarei Tzion 289:22) also records this practice of the Chazon Ish. </ref>, Ashkenazim place it on a slant, with the top leaning towards the inside and the bottom towards the outside.<ref>Rabbenu Tam cited by Tosfot Menachot 33a s.v. ha, Rama 289:6, Levush 289:6, Chayei Adam 15:19, Minchas Elazar 1:36:1, Pitchei Mezuzahs 289:57, Chovat Hadar 9:footnote 20. Chovat Hadar 9:footnote 20 explains that the reason for this is that the opinion of Rashi says if you place it sideways it is not kosher, while Rabbenu Tam Menachot 33a s.v. ha holds that if it is straight up it is not kosher, so Ashkenazim try to fulfill the mitzvah according to both opinions. Rav Wosner (Kovetz Mbet Levi v. 2 p. 131) holds that it isn't put up on a 45 degree angle, rather it is put on a small slant. Orchot Rabbenu v. 3 p. 173 writes that the Chazon Ish put his mezuzah on a slight slant, with the top of the mezuzah 3 cm from the bottom of the mezuzah (approximately at a 75 degree angle).</ref>


===Which Is the Right Side?===
===Which Is the Right Side?===
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#If the mezuzah was placed on the left side of the door it needs to be taken down and put up on the right side with a bracha.<ref>Hamezuzah Vehilchoteha 11:10, Kitzur Shulchan Aruch 11:3</ref>
#If the mezuzah was placed on the left side of the door it needs to be taken down and put up on the right side with a bracha.<ref>Hamezuzah Vehilchoteha 11:10, Kitzur Shulchan Aruch 11:3</ref>


===Back Door to Backyard===
====Back Door to Backyard====


#If there's a back door that opens to an enclosed backyard that is completely closed then the mezuzah should be placed on the right side going into the backyard.<ref>Maharil (responsa 94), Bet Yosef 289:3, Taz 289:3, Chelkat Yakov YD 161, Yabia Omer 6:23:6. The Chelkat Yakov writes that even though the Bet Meir and Chavot Daat ask on the Maharil since most poskim accept the Maharil we follow his opinion. His opinion is based on the concept that you walk from the house to the backyard and since the back door is an entrance to the backyard which has no other entrance then the mezuzah must be on the right entering the backyard. [http://www.yutorah.org/sidebar/lecture.cfm/788640/rabbi-hershel-schachter/the-laws-of-mezuzah/ Rav Hershel Schachter in “The Laws of Mezuzah” (min 34-42)] agreed.  
#If there's a back door that opens to an enclosed backyard that is completely closed then the mezuzah should be placed on the right side going into the backyard.<ref>Maharil (responsa 94), Bet Yosef 289:3, Taz 289:3, Chelkat Yakov YD 161, Yabia Omer 6:23:6. The Chelkat Yakov writes that even though the Bet Meir and Chavot Daat ask on the Maharil since most poskim accept the Maharil we follow his opinion. His opinion is based on the concept that you walk from the house to the backyard and since the back door is an entrance to the backyard which has no other entrance then the mezuzah must be on the right entering the backyard. [http://www.yutorah.org/sidebar/lecture.cfm/788640/rabbi-hershel-schachter/the-laws-of-mezuzah/ Rav Hershel Schachter in “The Laws of Mezuzah” (min 34-42)] agreed.  
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#If the back door opens into a backyard that has a gate to a courtyard or street then the back door should have a mezuzah on the right side going into the house because the house is used more than the backyard.<ref>The Maharil (responsa 94) wrote that if the back door opens into a backyard that has a gate to a street then the direction of the mezuzah is determined by which way the door opens. Taz 289:3 quotes it. Chelkat Yakov YD 161 writes that even though the Maharil writes that when there are two doors to a backyard the mezuzah is determined by the way the door opens, the Levush holds that we would put up the mezuzah going into the house since it is used more than the backyard. Furthermore, the Bet Meir and Chavot Daat disagree with the Maharil altogether even when the backyard has no other exit. Therefore, the Chelkat Yakov concludes that since the house is used more than the courtyard that trumps the rule of the fact that the majority of the walking is from the house to the courtyard. Igrot Moshe YD 1:181 and Yeshuot Malko (Mezuzah 6:1) agreed with the distinction of the Chelkat Yakov of accepting the first case of the Maharil but not when the courtyard is open to the street. [http://www.yutorah.org/sidebar/lecture.cfm/788640/rabbi-hershel-schachter/the-laws-of-mezuzah/ Rav Hershel Schachter in “The Laws of Mezuzah” (min 34-42)] agreed.</ref>
#If the back door opens into a backyard that has a gate to a courtyard or street then the back door should have a mezuzah on the right side going into the house because the house is used more than the backyard.<ref>The Maharil (responsa 94) wrote that if the back door opens into a backyard that has a gate to a street then the direction of the mezuzah is determined by which way the door opens. Taz 289:3 quotes it. Chelkat Yakov YD 161 writes that even though the Maharil writes that when there are two doors to a backyard the mezuzah is determined by the way the door opens, the Levush holds that we would put up the mezuzah going into the house since it is used more than the backyard. Furthermore, the Bet Meir and Chavot Daat disagree with the Maharil altogether even when the backyard has no other exit. Therefore, the Chelkat Yakov concludes that since the house is used more than the courtyard that trumps the rule of the fact that the majority of the walking is from the house to the courtyard. Igrot Moshe YD 1:181 and Yeshuot Malko (Mezuzah 6:1) agreed with the distinction of the Chelkat Yakov of accepting the first case of the Maharil but not when the courtyard is open to the street. [http://www.yutorah.org/sidebar/lecture.cfm/788640/rabbi-hershel-schachter/the-laws-of-mezuzah/ Rav Hershel Schachter in “The Laws of Mezuzah” (min 34-42)] agreed.</ref>


===Balcony or Porch===
====Balcony or Porch====


#A roofed front porch that is open to the front yard or street and opens up to the house is obligated in a mezuzah. If it has 4 amot by 4 amot of space it is obligated in a mezuzah with a bracha. If the area it surrounds is 16 square amot, one should put up a mezuzah without a bracha.<ref>HaMezuzah VeHilchoteha 3:10</ref>
#A roofed front porch that is open to the front yard or street and opens up to the house is obligated in a mezuzah. If it has 4 amot by 4 amot of space it is obligated in a mezuzah with a bracha. If the area it surrounds is 16 square amot, one should put up a mezuzah without a bracha.<ref>HaMezuzah VeHilchoteha 3:10</ref>
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#Even if the balcony is less than 4x4 amot and isn't roofed, according to Sephardim, the mezuzah should be placed on the right side going from the house to the balcony.<ref>Yabia Omer 4:23:6, Or Letzion 1:14, Hamezuzah Vehilchoteha 3:11. Or Letzion 1:14 writes that the minhag is to put a mezuzah on the right going from the house to the balcony. He explains that if the balcony is less than 4x4 amot it isn't considered obligated in a mezuzah in it of itself. Additionally, if it doesn't have a roof it isn't obligated in it of itself. However, since the balcony opens to the house which is obligated we can treat the balcony like a foyer (bet shaar) before the house which is obligated even if it is less than 4x4. However, the dispute is why the foyer is obligated. According to the Tosfot and Rosh it is only obligated rabbinically but it is obligated as a structure that is useful for its designated purpose. However, according to the Rambam, it is obligated biblically because it opens to a house. According to the Rambam the mezuzah should be placed on the right side going in from the balcony since the balcony is only obligated as it serves the house. However, according to the Tosfot and Rosh the mezuzah should be placed on the right side going from the house to the balcony as it is obligated in it of itself. Yet, the minhag is just to put a mezuzah on the right side going from the house to the balcony like the Rosh since perhaps we follow the Rosh and even if we don't we follow the opinion of the Chikrei Lev who holds that the balcony door can't be considered an entrance for the house since you can only use it if you first exited through it. He quotes that this was also the opinion of the Rosh Yeshiva of Porat Yosef, Rav Ezra Attiyah. </ref> Ashkenazim hold that if the balcony is less than the equivalent of 16 square amot the mezuzah should be put on the right side going from the balcony into the house. But if it is more than the equivalent of 16 square amot the mezuzah is placed on the right side going from the house out to the balcony.<ref>Hamezuzah Vehilchoteha ch. 3 fnt. 19 cites the Chiko Mamtakim p. 359 who quotes Rav Shlomo Zalman Auerbach has holding that a balcony that is 4x4 amot square or the equivalent should have the mezuzah from the house to the balcony like the Maharil, but if the balcony is smaller than that it should have a mezuzah on the right side from the balcony to the house like the Bet Meir, Chazon Ish, and Rabbi Akiva Eiger. Inside Stam p. 212 quotes that Rav Moshe Feinstein, Or Letzion 1:14, and Minchat Yitzchak 1:8-9 that the mezuzah should be put on the right side going out. He also quotes that Rav Elyashiv, Rav Wosner, and Rav Nissim Karelitz held that the mezuzah should be put on the left side going out.</ref>
#Even if the balcony is less than 4x4 amot and isn't roofed, according to Sephardim, the mezuzah should be placed on the right side going from the house to the balcony.<ref>Yabia Omer 4:23:6, Or Letzion 1:14, Hamezuzah Vehilchoteha 3:11. Or Letzion 1:14 writes that the minhag is to put a mezuzah on the right going from the house to the balcony. He explains that if the balcony is less than 4x4 amot it isn't considered obligated in a mezuzah in it of itself. Additionally, if it doesn't have a roof it isn't obligated in it of itself. However, since the balcony opens to the house which is obligated we can treat the balcony like a foyer (bet shaar) before the house which is obligated even if it is less than 4x4. However, the dispute is why the foyer is obligated. According to the Tosfot and Rosh it is only obligated rabbinically but it is obligated as a structure that is useful for its designated purpose. However, according to the Rambam, it is obligated biblically because it opens to a house. According to the Rambam the mezuzah should be placed on the right side going in from the balcony since the balcony is only obligated as it serves the house. However, according to the Tosfot and Rosh the mezuzah should be placed on the right side going from the house to the balcony as it is obligated in it of itself. Yet, the minhag is just to put a mezuzah on the right side going from the house to the balcony like the Rosh since perhaps we follow the Rosh and even if we don't we follow the opinion of the Chikrei Lev who holds that the balcony door can't be considered an entrance for the house since you can only use it if you first exited through it. He quotes that this was also the opinion of the Rosh Yeshiva of Porat Yosef, Rav Ezra Attiyah. </ref> Ashkenazim hold that if the balcony is less than the equivalent of 16 square amot the mezuzah should be put on the right side going from the balcony into the house. But if it is more than the equivalent of 16 square amot the mezuzah is placed on the right side going from the house out to the balcony.<ref>Hamezuzah Vehilchoteha ch. 3 fnt. 19 cites the Chiko Mamtakim p. 359 who quotes Rav Shlomo Zalman Auerbach has holding that a balcony that is 4x4 amot square or the equivalent should have the mezuzah from the house to the balcony like the Maharil, but if the balcony is smaller than that it should have a mezuzah on the right side from the balcony to the house like the Bet Meir, Chazon Ish, and Rabbi Akiva Eiger. Inside Stam p. 212 quotes that Rav Moshe Feinstein, Or Letzion 1:14, and Minchat Yitzchak 1:8-9 that the mezuzah should be put on the right side going out. He also quotes that Rav Elyashiv, Rav Wosner, and Rav Nissim Karelitz held that the mezuzah should be put on the left side going out.</ref>


===Walk-in Closet===
====Walk-in Closet====


#The questions to clarify for whether a closet is obligated in a mezuzah and as to which side the mezuzah is placed depends on the following:
#The questions to clarify for whether a closet is obligated in a mezuzah and as to which side the mezuzah is placed depends on the following:
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##Most poskim hold that an area that has 16 square amot, even if it doesn't have 4x4 amot in any one place, is obligated in a mezuzah<ref>The Rambam (Mezuzah 6:2) holds that an area that is 2x8 amot is obligated in a mezuzah as would any area that is larger than 16 square amot. The Rosh (Mezuzah no. 16) disagrees and holds that unless it is 4x4 amot square it isn’t obligated. Rashba (responsa 5:110) agrees. Shulchan Aruch Y.D. 286:13 holds like the Rambam. Levush 286:13 agrees. The Shach 286:23 holds that it is obligated but the mezuzah should be put up without a bracha. Chayei Adam 15:6, Aruch Hashulchan YD 286:21, Halichot Olam v. 8. p. 282, and Yalkut Yosef 285:24 agree. Rav Wosner (Kovetz Mbet Levi p. 129) agrees. Eliya Rabba 366:5 also seems to agree with the Shach.  
##Most poskim hold that an area that has 16 square amot, even if it doesn't have 4x4 amot in any one place, is obligated in a mezuzah<ref>The Rambam (Mezuzah 6:2) holds that an area that is 2x8 amot is obligated in a mezuzah as would any area that is larger than 16 square amot. The Rosh (Mezuzah no. 16) disagrees and holds that unless it is 4x4 amot square it isn’t obligated. Rashba (responsa 5:110) agrees. Shulchan Aruch Y.D. 286:13 holds like the Rambam. Levush 286:13 agrees. The Shach 286:23 holds that it is obligated but the mezuzah should be put up without a bracha. Chayei Adam 15:6, Aruch Hashulchan YD 286:21, Halichot Olam v. 8. p. 282, and Yalkut Yosef 285:24 agree. Rav Wosner (Kovetz Mbet Levi p. 129) agrees. Eliya Rabba 366:5 also seems to agree with the Shach.  


*However, the Taz OC 634:1 argues that everyone holds it is exempt. Shulchan Aruch Harav OC 366:5, Chazon Ish OC 110:28, YD 169:5, Rav Nissim Karelitz in Chut Shani (Mezuzah p. 82), Steipler (Orchot Rabbenu v. 4 p. 239), Rav Yitzchak Abadi in Or Yitzchak 2:52, and [http://www.yutorah.org/sidebar/lecture.cfm/839765/rabbi-baruch-simon/%D7%91%D7%A2%D7%A0%D7%99%D7%9F-%D7%9E%D7%A7%D7%95%D7%9D-%D7%A7%D7%91%D7%99%D7%A2%D7%AA-%D7%94%D7%9E%D7%96%D7%95%D7%96%D7%94/ Rabbi Baruch Simon] accept the Taz. Mishna Brurah 366:22 cites the dispute and in Shaar Hatziyun 366:13 he favors the opinion of the Taz.
*The Taz OC 634:1 argues that everyone holds it is exempt. Shulchan Aruch Harav OC 366:5, Chazon Ish OC 110:28, YD 169:5, Rav Nissim Karelitz in Chut Shani (Mezuzah p. 82), Steipler (Orchot Rabbenu v. 4 p. 239), Rav Yitzchak Abadi in Or Yitzchak 2:52, and [http://www.yutorah.org/sidebar/lecture.cfm/839765/rabbi-baruch-simon/%D7%91%D7%A2%D7%A0%D7%99%D7%9F-%D7%9E%D7%A7%D7%95%D7%9D-%D7%A7%D7%91%D7%99%D7%A2%D7%AA-%D7%94%D7%9E%D7%96%D7%95%D7%96%D7%94/ Rabbi Baruch Simon] accept the Taz. Mishna Brurah 366:22 cites the dispute and in Shaar Hatziyun 366:13 he favors the opinion of the Taz.
*Chatom Sofer YD 280 and Maamar Mordechai 634:2 defend the Shulchan Aruch against the Taz. Gra 286:13 understands the Rambam like the Rosh but holds like the Rosh. Maharalbach 110 rules like the Rambam. Magen Avraham 366:6 assumes like the Shulchan Aruch, while Magen Avraham 398:6 assumes like the Taz. Additionally, according to the Chamudei Doniel obviously an area that is 2x8 is obligated if it is usable since according to his opinion if it is usable it is obligated even if it is less than 4x4.</ref> going into the closet without a bracha.<ref>In light of the Rabbi Akiva Eiger the closet should have a mezuzah on the right going out of the closet, but since according to the Rambam this closet needs a mezuzah going into the closet and the Chamudei Doniel would also have the mezuzah placed going in, many poskim hold that the mezuzah is placed going into the closet. This is the opinion of Rav Shlomo Zalman (cited by Hamezuzah Vehilchoteha ch. 3 fnt. 19), Teshuvot Vehanhagot 1:653, and Agur Bohalecha 19:7.</ref> It doesn't matter what shape it is in as long as it is usable.<ref>Rishon Letzion Sukkah 3a and 8a writes that obviously even for the Rambam it has to be usable. Therefore, a 1x16 amot house isn't obligated in a mezuzah since it is unusable, however, a 2x8 house is obligated. He also has a nuance that for a rectangle we calculate total area, but for a circle or other shapes we have to inscribe a rectangle inside that shape and use the area of that rectangle. However, the other poskim quoted in the previous footnote in understanding the Rambam did not make such a distinction.</ref>
*Chatom Sofer YD 280 and Maamar Mordechai 634:2 defend the Shulchan Aruch against the Taz. Gra 286:13 understands the Rambam like the Rosh but holds like the Rosh. Maharalbach 110 rules like the Rambam. Magen Avraham 366:6 assumes like the Shulchan Aruch, while Magen Avraham 398:6 assumes like the Taz. Additionally, according to the Chamudei Doniel obviously an area that is 2x8 is obligated if it is usable since according to his opinion if it is usable it is obligated even if it is less than 4x4.</ref> going into the closet without a bracha.<ref>In light of the Rabbi Akiva Eiger the closet should have a mezuzah on the right going out of the closet, but since according to the Rambam this closet needs a mezuzah going into the closet and the Chamudei Doniel would also have the mezuzah placed going in, many poskim hold that the mezuzah is placed going into the closet. This is the opinion of Rav Shlomo Zalman (cited by Hamezuzah Vehilchoteha ch. 3 fnt. 19), Teshuvot Vehanhagot 1:653, and Agur Bohalecha 19:7.</ref> It doesn't matter what shape it is in as long as it is usable.<ref>Rishon Letzion Sukkah 3a and 8a writes that obviously even for the Rambam it has to be usable. Therefore, a 1x16 amot house isn't obligated in a mezuzah since it is unusable, however, a 2x8 house is obligated. He also has a nuance that for a rectangle we calculate total area, but for a circle or other shapes we have to inscribe a rectangle inside that shape and use the area of that rectangle. However, the other poskim quoted in the previous footnote in understanding the Rambam did not make such a distinction.</ref>
##A walk-in closet that is not 4x4 amot and doesn't even have the area of 4x4 amot, according to most poskim it is completely exempt from a mezuzah, though some say it is obligated since it is useful the way it is.<ref>Chamudei Doniel (Pitchei Teshuva 286:11) writes that an area that is meant to be used the way it is even if it is less than 4x4 amot is obligated in a mezuzah. Rashash Sukkah 3b s.v. may agrees. Maharam Shik 287 accepts the Chamudei Doniel. Agur Bohalecha quotes Minchat Yitzchak 1:8, 3:103, Even Yisrael 7:34, and Chovat Hadar 8:6 as being concerned for the opinion of the Chamudei Doniel. Or Letzion 1:14 only accepts the Chamudei Doniel regarding a small room open to a house.
##A walk-in closet that is not 4x4 amot and doesn't even have the area of 4x4 amot, according to most poskim it is completely exempt from a mezuzah, though some say it is obligated since it is useful the way it is.<ref>Chamudei Doniel (Pitchei Teshuva 286:11) writes that an area that is meant to be used the way it is even if it is less than 4x4 amot is obligated in a mezuzah. Rashash Sukkah 3b s.v. may agrees. Maharam Shik 287 accepts the Chamudei Doniel. Agur Bohalecha quotes Minchat Yitzchak 1:8, 3:103, Even Yisrael 7:34, and Chovat Hadar 8:6 as being concerned for the opinion of the Chamudei Doniel. Or Letzion 1:14 only accepts the Chamudei Doniel regarding a small room open to a house.


*However, Mikdash Me’at 286:39 strongly disagrees with the Chamudei Doniel. Yabia Omer 4:23:4-5 quotes Rav Shlomo Kluger (Kinat Sofrim 118), Teshuvot Lshoel 16, and Rav Chaim Zonenfeld in Salmat Chaim YD 105 disagreed with the Chamudei Doniel, while the Maharsham 3:154 agreed with the Chamudei Doniel. He concludes that the primary halacha is that the room is exempt. Shevet Halevi 2:152 and Agur Bohalecha 18:28 rule against the Chamudei Doniel.
*On the other hand, Mikdash Me’at 286:39 strongly disagrees with the Chamudei Doniel. Yabia Omer 4:23:4-5 quotes Rav Shlomo Kluger (Kinat Sofrim 118), Teshuvot Lshoel 16, and Rav Chaim Zonenfeld in Salmat Chaim YD 105 disagreed with the Chamudei Doniel, while the Maharsham 3:154 agreed with the Chamudei Doniel. He concludes that the primary halacha is that the room is exempt. Shevet Halevi 2:152 and Agur Bohalecha 18:28 rule against the Chamudei Doniel.
*Orchot Rabbenu v. 3 p. 165 quotes the Chazon Ish as holding that we do not hold like the Chamudei Doniel. See Agur Bohalecha who discusses this further but generally agrees that the Chazon Ish disregarded the Chamudei Doniel. [http://www.yutorah.org/sidebar/lecture.cfm/839765/rabbi-baruch-simon/%D7%91%D7%A2%D7%A0%D7%99%D7%9F-%D7%9E%D7%A7%D7%95%D7%9D-%D7%A7%D7%91%D7%99%D7%A2%D7%AA-%D7%94%D7%9E%D7%96%D7%95%D7%96%D7%94/ Rabbi Simon in an article on mezuzot] agrees.</ref> Therefore, strictly speaking it doesn't need a mezuzah, but many poskim are strict to place a mezuzah going out from the closet into the room that itself is obligated in a mezuzah.<ref>Rabbi Akiva Eiger 286:13 writes that since the area is exempt from a mezuzah it can still be considered an entrance into the room. Shiltei Giborim (Hilchot Mezuzah 6b) cites the Riaz who holds of the same concept. The Chazon Ish YD 168:5 and 169:2 agrees and adds that accordingly the mezuzah should be placed on the left side, which is the right side going from the exempt area into the room. Rav Shlomo Zalman Auerbach (cited by Hamezuzah Vehilchoteha ch. 3 fnt. 19), Rav Wosner (Shevet Halevi 2:152, 2:156:286:13), Rav Elyashiv (Kovetz Teshuvot 2:6:3), Rav Shternbuch (Teshuvot Vehanhagot 1:653), [http://www.yutorah.org/sidebar/lecture.cfm/788640/rabbi-hershel-schachter/the-laws-of-mezuzah/ Rav Hershel Schachter in “The Laws of Mezuzah” (min 34-42)], Rav Aharon Lichtenstein (cited by [https://www.koltorah.org/halachah/do-walk-in-closets-and-porches-require-a-mezuzah-by-rabbi-chaim-jachter Rabbi Jachter]), Binyan Tzion 99, and Rav Heinemann (Star-K Kashrut Kurrents Winter 5779 p. 2; Guide to Halachos p. 101) agree.  
*Orchot Rabbenu v. 3 p. 165 quotes the Chazon Ish as holding that we do not hold like the Chamudei Doniel. See Agur Bohalecha who discusses this further but generally agrees that the Chazon Ish disregarded the Chamudei Doniel. [http://www.yutorah.org/sidebar/lecture.cfm/839765/rabbi-baruch-simon/%D7%91%D7%A2%D7%A0%D7%99%D7%9F-%D7%9E%D7%A7%D7%95%D7%9D-%D7%A7%D7%91%D7%99%D7%A2%D7%AA-%D7%94%D7%9E%D7%96%D7%95%D7%96%D7%94/ Rabbi Simon in an article on mezuzot] agrees.</ref> Therefore, strictly speaking it doesn't need a mezuzah, but many poskim are strict to place a mezuzah going out from the closet into the room that itself is obligated in a mezuzah.<ref>Rabbi Akiva Eiger 286:13 writes that since the area is exempt from a mezuzah it can still be considered an entrance into the room. Shiltei Giborim (Hilchot Mezuzah 6b) cites the Riaz who holds of the same concept. The Chazon Ish YD 168:5 and 169:2 agrees and adds that accordingly the mezuzah should be placed on the left side, which is the right side going from the exempt area into the room. Rav Shlomo Zalman Auerbach (cited by Hamezuzah Vehilchoteha ch. 3 fnt. 19), Rav Wosner (Shevet Halevi 2:152, 2:156:286:13), Rav Elyashiv (Kovetz Teshuvot 2:6:3), Rav Shternbuch (Teshuvot Vehanhagot 1:653), [http://www.yutorah.org/sidebar/lecture.cfm/788640/rabbi-hershel-schachter/the-laws-of-mezuzah/ Rav Hershel Schachter in “The Laws of Mezuzah” (min 34-42)], Rav Aharon Lichtenstein (cited by [https://www.koltorah.org/halachah/do-walk-in-closets-and-porches-require-a-mezuzah-by-rabbi-chaim-jachter Rabbi Jachter]), Binyan Tzion 99, and Rav Heinemann (Star-K Kashrut Kurrents Winter 5779 p. 2; Guide to Halachos p. 101) agree.  


*However, the Chikrei Lev YD 129 argues that since the area is exempt in it of itself it is never considered an entrance just because you can enter it and then while exiting it enter into another room. That is considered an exit and not entering. Or Letzion YD 1:14 isn’t certain if the Chikrei Lev is correct but he certainly considers his opinion significant. Yabia Omer 4:23:6 is also uncertain of Rabbi Akiva Eiger and cites Tzur Yakov and Tarshish Shoham quoting Lechem Hapanim who disagree with Rabbi Akiva Eiger. Igrot Moshe YD 1:181, Agur Bohalecha 19:6, [https://www.hebrewbooks.org/pdfpager.aspx?req=123&st=&pgnum=235 Chesed Lavraham YD 91], Yalkut Yosef 286:21, and [http://www.yutorah.org/sidebar/lecture.cfm/839765/rabbi-baruch-simon/%D7%91%D7%A2%D7%A0%D7%99%D7%9F-%D7%9E%D7%A7%D7%95%D7%9D-%D7%A7%D7%91%D7%99%D7%A2%D7%AA-%D7%94%D7%9E%D7%96%D7%95%D7%96%D7%94/ Rabbi Baruch Simon] all agree with Chikrei Lev and reject Rabbi Akiva Eiger. Therefore, strictly speaking the closet is exempt from a mezuzah.
*In disagreement with Rabbi Akiva Eiger, the Chikrei Lev YD 129 posits that since the area is exempt in it of itself it is never considered an entrance just because you can enter it and then while exiting it enter into another room. That is considered an exit and not entering. Or Letzion YD 1:14 isn’t certain if the Chikrei Lev is correct but he certainly considers his opinion significant. Yabia Omer 4:23:6 is also uncertain of Rabbi Akiva Eiger and cites Tzur Yakov and Tarshish Shoham quoting Lechem Hapanim who disagree with Rabbi Akiva Eiger. Igrot Moshe YD 1:181, Agur Bohalecha 19:6, [https://www.hebrewbooks.org/pdfpager.aspx?req=123&st=&pgnum=235 Chesed Lavraham YD 91], Yalkut Yosef 286:21, and [http://www.yutorah.org/sidebar/lecture.cfm/839765/rabbi-baruch-simon/%D7%91%D7%A2%D7%A0%D7%99%D7%9F-%D7%9E%D7%A7%D7%95%D7%9D-%D7%A7%D7%91%D7%99%D7%A2%D7%AA-%D7%94%D7%9E%D7%96%D7%95%D7%96%D7%94/ Rabbi Baruch Simon] all agree with Chikrei Lev and reject Rabbi Akiva Eiger. Therefore, strictly speaking the closet is exempt from a mezuzah.
*Orchot Rabbenu v. 3 p. 165 quotes the Steipler ruled like the Rabbi Akiva Eiger. Shevet Halevi 2:152 understands that the Bet Meir 289 agrees with Rabbi Akiva Eiger.
*Orchot Rabbenu v. 3 p. 165 quotes the Steipler ruled like the Rabbi Akiva Eiger. Shevet Halevi 2:152 understands that the Bet Meir 289 agrees with Rabbi Akiva Eiger.
*There is a possibility that the mezuzah should be placed from the big room into the small room. That is an idea Sfat Emet YD 289 suggested and Agur Bohalecha 19:6 in fact posits is the opinion of Rabbi Akiva Eiger. In practice, he agrees with the Chazon Ish to put the mezuzah going into the big room.</ref> Either way, the mezuzah is put up without a bracha.<ref>Agur Bohalecha 19:6 and Teshuvot Vehanahgot 1:653 unlike Shevet Halevi 2:152 who writes that one can recite a bracha following Rabbi Akiva Eiger.</ref> According to Sephardim, the closet is exempt.<ref>Halichot Olam v. 8 p. 282 and Yalkut Yosef 285:21 writes that a room that is less than 4x4 amot is exempt. Therefore, Mezuzah Vhilchoteha writes that a walk-in closet that isn't 4x4 amot is completely exempt for Sephardim. If one wanted to be strict, this could be related to the discussion of a balcony that is less than 4x4. Or Letzion YD 1:14 writes that he partially rejects the Chamudei Doniel, but through his understanding of the topic, agrees in practice to place a mezuzah on the right going into a balcony that is exempt because it is less than 4x4 amot or isn't roofed. His reasoning is that according to the Rosh the balcony should be obligated since it is useful and the Chikrei Lev argues with Rabbi Akiva Eiger that the mezuzah is not place on the right side coming off the balcony. Yabia Omer 4:23:6 also writes that strictly speaking the balcony that is less than 16 square amot is exempt, but if one wants to be strict one should put it on the right side. going into the house.</ref>
*There is a possibility that the mezuzah should be placed from the big room into the small room. That is an idea Sfat Emet YD 289 suggested and Agur Bohalecha 19:6 in fact posits is the opinion of Rabbi Akiva Eiger. In practice, he agrees with the Chazon Ish to put the mezuzah going into the big room.</ref> Either way, the mezuzah is put up without a bracha.<ref>Agur Bohalecha 19:6 and Teshuvot Vehanahgot 1:653 unlike Shevet Halevi 2:152 who writes that one can recite a bracha following Rabbi Akiva Eiger.</ref> According to Sephardim, the closet is exempt.<ref>Halichot Olam v. 8 p. 282 and Yalkut Yosef 285:21 writes that a room that is less than 4x4 amot is exempt. Therefore, Mezuzah Vhilchoteha writes that a walk-in closet that isn't 4x4 amot is completely exempt for Sephardim. If one wanted to be strict, this could be related to the discussion of a balcony that is less than 4x4. Or Letzion YD 1:14 writes that he partially rejects the Chamudei Doniel, but through his understanding of the topic, agrees in practice to place a mezuzah on the right going into a balcony that is exempt because it is less than 4x4 amot or isn't roofed. His reasoning is that according to the Rosh the balcony should be obligated since it is useful and the Chikrei Lev argues with Rabbi Akiva Eiger that the mezuzah is not place on the right side coming off the balcony. Yabia Omer 4:23:6 also writes that strictly speaking the balcony that is less than 16 square amot is exempt, but if one wants to be strict one should put it on the right side. going into the house.</ref>
#A closet that you do not walk into is exempt from a mezuzah.<ref>Shaarei Hamezuzah 10:16, Agur Bohalecha 19:10, Mezuzah Vehilchoteha 3:8</ref>
#A closet that you do not walk into is exempt from a mezuzah.<ref>Shaarei Hamezuzah 10:16, Agur Bohalecha 19:10, Mezuzah Vehilchoteha 3:8</ref>
===Straight or Diagonal===
#While Sephardim place the mezuzah straight up<ref>Rashi Menachot 33a s.v. pesula, Shulchan Aruch Y.D. 289:6, Ben Ish Chai Ki Tavo Year 2 Halacha 7. This was also the minhag of the Gr"a (Biurei Hagra 289:14 and Maaseh Rav n. 97). Also see Orchos Rabbeinu 1:page 378:27 who quotes that the Chazon Ish and Steipler put their mezuzot on a small slant because if it would be on a diagonal one doesn't fulfill the opinion of Rashi or Tosfot. Rav Chaim Kanievsky in Mezuzot Beytecha (Shaarei Tzion 289:22) also records this practice of the Chazon Ish. </ref>, Ashkenazim place it on a slant, with the top leaning towards the inside and the bottom towards the outside.<ref>Rabbenu Tam cited by Tosfot Menachot 33a s.v. ha, Rama 289:6, Levush 289:6, Chayei Adam 15:19, Minchas Elazar 1:36:1, Pitchei Mezuzahs 289:57, Chovat Hadar 9:footnote 20. Chovat Hadar 9:footnote 20 explains that the reason for this is that the opinion of Rashi says if you place it sideways it is not kosher, while Rabbenu Tam Menachot 33a s.v. ha holds that if it is straight up it is not kosher, so Ashkenazim try to fulfill the mitzvah according to both opinions. Rav Wosner (Kovetz Mbet Levi v. 2 p. 131) holds that it isn't put up on a 45 degree angle, rather it is put on a small slant. Orchot Rabbenu v. 3 p. 173 writes that the Chazon Ish put his mezuzah on a slight slant, with the top of the mezuzah 3 cm from the bottom of the mezuzah (approximately at a 75 degree angle).</ref>
===Height===
#The mezuzah should be placed at the beginning of the upper third of the height of the doorway<ref>Kitzur Shulchan Aruch 11:5, Rashi Menachot 33a s.v. “bitechila,” Rambam Hilchot Mezuzah 6:12, Tur 289, Prisha 289:6, Shulchan Aruch 289:2, Levush 289:2, Chayei Adam 15:17, Pitchei Mezuzahs 289:24, Chovat Hadar 8:2:4, Teshuvot Vihanhagot 2:539. See Yabia Omer YD 2:21 where Chacham Ovadia Yosef quotes poskim who say that if it was placed higher than the beginning of the top third it should be moved without a beracha to there, but himself disagrees. </ref> but it should be placed at least a [[Tefach]] from the top of the doorway. <ref>Tur 289, Shulchan Aruch 289:2, Levush 289:2, Kitzur Shulchan Aruch 11:5 </ref> If it is not in the top third it isn't kosher. <ref>Beit Yosef 289, Shach 289:4, Taz 289:3. </ref> If it isn't a tefach from the top of the door it should be fixed.<ref>Mezuzah Vehilchoteha 11:8 quotes Halichot Olam v. 8 p. 251 who writes that according to Shulchan Aruch if the mezuzah is within a tefach of the ceiling it needs to be fixed. He says that it is in disagreement with the Ben Ish Chai Ki Tavo n. 7 who writes that after the fact it is kosher.</ref>
#If a doorway is very tall, according to Ashkenazim, one should put up the mezuzah at shoulder height.<ref>Yerushalmi Megillah 4:12, Tosfot Yoma 11b s.v. shein, Shach 289:4</ref> However, according to Sephardim, one should place it in the upper third in all circumstances.<ref>Yalkut Yosef YD 285:77</ref>
===In the Doorframe===
<center><gallery>
Exterior mezuzah.png|Picture #1: Mezuzah on wall in front of door within tefach
Door inward.png|Picture #2: Inward swinging door with mezuzah behind door within frame
Inner post.png|Picture #3: Blue mezuzah on thicker post and gold on thinner post
</gallery></center>
#The mezuzah is placed on the right side of the doorframe underneath the lintel within a tefach of the outside of the doorframe.<ref>Shulchan Aruch Y.D. 289:1</ref> The mezuzah must be placed so that it is visible or there is a symbol to indicate that there is a mezuzah.<ref>[https://hebrewbooks.org/pdfpager.aspx?req=14428&pgnum=53 Yad Haketana (ch. 3 fnt. 25)] explains that it is critical to the mezuzah that a person be able to see the mezuzah and thinking about Hashem. If it is inserted into the post there must be a symbol engraved on the outside of the post to indicate that there is a mezuzah there.</ref>
#If there is no place to put the mezuzah within the doorframe (picture #1), according to Ashkenazim the mezuzah can be placed on the area in front of the doorframe within a tefach of the doorframe.<ref>According to the Shach's understanding the Rama 289:1 rules like the Tur that after the fact a mezuzah is kosher if it is behind the door outside of the doorframe. Agur Bohalecha siman 44-46 discusses at length whether having the mezuzah in front of the doorframe is the equivalent of behind the doorframe or better. Either way, in a case where it is impossible to put it in the doorframe it is best to put it in front of the doorframe.</ref> According to Sephardim it must be placed within the doorframe in front of the door or behind the door (picture #2).<ref>Shulchan Aruch, Yalkut Yosef (Sova Semachot v. 1 "Makom Hamezuza" n. 70). Yalkut Yosef clarifies that having the mezuzah within the doorframe behind the door is also called in the doorway and kosher for Shulchan Aruch. Agur Bohalecha siman 43 agrees.</ref>
#If a doorpost has a thicker post and a thinner post which is further towards the outside (picture #3), the mezuzah can be placed on the thinner part (gold mezuzah in picture).<ref>Agur Bohalecha 13:6</ref> Some hold it should be placed specifically on the thicker part (blue mezuzah in picture).<ref>Chovat Hadar 8:3:1 fnt. 3 explaining the position of Rav Dovid Yungreis</ref>
#The mezuzah should not be placed behind the door on the wall next to the doorframe. If it is, according to many poskim, the mezuzah is invalid.<ref>Shulchan Aruch Y.D. 289:1 holds that it is invalid. Shach 291:3 explains while the Tur and Rama hold it is valid after the fact, the Bet Yosef and Levush hold otherwise. He is strict for the Bet Yosef. Nishmat Adam 15:1 shows that most rishonim hold it is valid and in extenuating circumstances it is permitted to place it there without a bracha.</ref>
===Fixed to the Doorpost===
#A mezuzah should be established in a sturdy way so that it won't fall down. Also, it should not be hanging.<ref>Shulchan Aruch Y.D. 289:1. Bach understands the reason that the halacha insists that a mezuzah should be put up with nails is so that it doesn't fall down. One should establish it in a way that even in the unlikely scenario it won't fall down. The Chayei Adam 15:19 implies that the reason that it should be put up with two nails is because if one only uses one mezuzah on top, the mezuzah is like it is hanging and the mezuzah should not be hanging. </ref>
#A mezuzah could be put up with nails, one on top and one on bottom, but not with just one nail.<ref>Shulchan Aruch Y.D. 289:1, Chayei Adam 15:19</ref> If one put it up with only one nail but it was tightly fastened to the wall and doesn't move it is valid.<ref>Agur Bohalecha 10:3</ref>
#A mezuzah could be put up with tape or glue.<ref>Agur Bohalecha 10:4. Rav Chaim Kanievsky in Daat Noteh p. 472 writes that initially one should not put up a mezuzah with glue.</ref>
#Some say that a mezuzah could be put up with Velcro.<ref>Agur Bohalecha 10 quoting Rav Elyashiv</ref>
#Some say that a mezuzah shouldn't be put up with a magnet.<ref>Rav Chaim Kanievsky in Daat Noteh p. 472</ref>
#The minhag is to put the mezuzah in a case.<ref>Maaseh Rav n. 98 cites the practice of the Gra to place the mezuzah directly onto the post with no case specifically so that there’s no intoposition between the mezuzah and the post. Pitchei Teshuva 289:2 quotes this but questions it. However, Aruch Hashulchan 289:19 and Yabia Omer YD 8:29 strongly disagree with this citation and think that the Gra never said it. Agur Bohalecha (ch. 9 fnt. 3) writes that the minhag is not concerned for this citation of the Gra and it isn’t recommended since it will make the mezuzot invalid much more quickly. He also records the practice of Brisk to follow this citation of the Gra.</ref>
===Arched Doorway===
#If the doorway is arched there is a dispute whether the height of the doorposts includes the arched section where the doorway has a width of 4 tefachim. Therefore, if there is a small area which is arched and the doorway has a width of greater than 4 tefachim, it is possible to satisfy both opinions by placing it on the vertical section of the door but still within the top third of the doorway.<ref>Chovat Hadar (p. 59, n. 35)</ref> (For example, if a doorway is 90 inches and the top 12 inches are arched and still has a width of tefachim, one should place the mezuzah in the vertical section above 60 inches.<ref>According to the opinion that the arched section is included the mezuzah should be placed at 60 inches (2/3 of 90) and above and according to the opinion that the arched section isn't included the mezuzah should be placed at 52 inches (2/3 of 78) and above. To satisfy both opinions one can place it at 60 inches where the doorpost is still vertical. </ref>)
#If the height of the arch is more than one third of the height of the entire doorway so that it isn't possible to satisfy both opinions the primary opinion is to place the mezuzah two thirds up the vertical part of the doorway excluding the arch.<ref>Chovat Hadar p. 60 n. 35 writes that the Taz 287:2 in such a case says to place the mezuzah in the arched part like Rashi. He explains that even Rambam could agree since anyway there is a vertical doorway that is 10 tefachim. Chovat Hadar quotes achronim who disagree and side with Rambam. Shulchan Aruch YD 287:2 holds like the Rambam. More details about [https://www.vaadmhk.org/mezuzah-archway/ how to affix a mezuzah on an archway].</ref>
===Posts that Don't Reach the Ceiling===
[[Image:Short Doorposts.png|right|200px]]
#If there are doorposts which are ten tefachim but they don't reach the ceiling and there is a wall which reaches the ceiling the mezuzah should be placed on the doorposts and not the wall (spot ב in the picture).<ref>Derech Hachaim 240:8, Pitchei Teshuva 286:10, Kitzur Shulchan Aruch 11:12, Chovat Hadar 8:2:2, Agur Bohalecha 22:24, [https://www.yutorah.org/lectures/lecture.cfm/1037727/Rabbi%20Mordechai%20I.%20Willig/Mezuzah%20Shiur%2028%20-%20Elevators,%20Accordion%20Doors,%20Garages,%20Hospitals Rav Mordechai Willig (Mezuzah Shiur 28 min 22)].
*Derech Hachayim 240:8 writes that if a doorpost doesn't reach the ceiling the mezuzah should be placed on that doorpost as long as it is ten tefachim tall. The Mikdash Me'at 286:36 establishes the case of the Derech Hachaim to only when the door reaches within a third of the entire doorway. However, the Keviyut Mezuzah Khilchata p. 389 points out that this Mikdash Me'at is a very difficult explanation of the Derech Hachaim. He agrees with the Derech Hachaim. Also, Chovat Hadar 8:2:2 p. 73 writes that if there are doorposts which are ten tefachim they are considered the right place for the mezuzah even though they do not reach the ceiling and there is a wall which does reach the ceiling. Sechel Tov 289:73 quotes others who agree with the Chovat Hadar. However, [http://www.yutorah.org/sidebar/lecture.cfm/839765/rabbi-baruch-simon/%D7%91%D7%A2%D7%A0%D7%99%D7%9F-%D7%9E%D7%A7%D7%95%D7%9D-%D7%A7%D7%91%D7%99%D7%A2%D7%AA-%D7%94%D7%9E%D7%96%D7%95%D7%96%D7%94/ Rabbi Simon] discusses this case at length and comes to the conclusion that it should be placed on the wall if the doorposts aren't shoulder height (spot א in the picture).
*In theory, Keviyut Mezuzah Khilchata 9:4 writes that there's two reasons why such a doorway would require a mezuzah. 1) The ten tefach posts are viewed as though they are extended up to the ceiling based on '''gud asik''' (Meiri Eruvin 11b, Sh"t Rav Eliyahu Mizrachi 2:26). 2) The posts don't need to touch the roof (Chesed Lavraham 16, Chazon Ish 170:3). Seemingly according to the first approach the mezuzah would be placed a third of the way to the ceiling, whereas the second approach would say to put it a third of the way up the post itself. He points out that another factor to consider is whether the mezuzah needs to be within a third of the height of the post or the doorway.</ref>


==Having One's Mezuzot Checked==  
==Having One's Mezuzot Checked==  
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