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There is a positive commandment to set up a mezuzah on every doorpost. <ref>Rambam Sefer HaMitzvot Positive Commandment 15, Sefer HaChinuch Mitzvah 423, Kitzur Shulchan Aruch 11:1 from Devarim 6:9 and 11:20. Shulchan Aruch YD 285:1, Chayei Adam 15:13, Aruch Hashulchan 285:2 say that one should be very meticulous with this mitzva. Tur YD 285 writes based on the pasuk that follows in Parashat Ekev, 11:21, that one who is meticulous in this mitzva merits long life. Bach YD 285 and Aruch Hashulchan YD 285:3 write that a house with a mezuzah has extra protection. </ref> The details as to which doorways, how the mezuzah should be placed, and the bracha are described below.
There is a positive commandment to set up a mezuzah on every doorpost. <ref>Rambam Sefer HaMitzvot Positive Commandment 15, Sefer HaChinuch Mitzvah 423, Kitzur Shulchan Aruch 11:1 from Devarim 6:9 and 11:20. Shulchan Aruch YD 285:1, Chayei Adam 15:13, Aruch Hashulchan 285:2 say that one should be very meticulous with this mitzva. Tur YD 285 writes based on the pasuk that follows in Parashat Ekev, 11:21, that one who is meticulous in this mitzva merits long life. Bach YD 285 and Aruch Hashulchan YD 285:3 write that a house with a mezuzah has extra protection. </ref> The details as to which doorways, how the mezuzah should be placed, and the bracha are described below.


==Which doorposts require a mezuzah==
==Types of Doors==
[[Image:porch.jpg|100px|right]]
===Double Doors===
 
[[Image:Double doors with poll.jpg|200px|right]]
#Every doorway of one's house is obligated in mezuzah. Even if a room has several doorways, each one is obligated in having a mezuzah. If a doorway isn't used for entering it doesn't need a mezuzah.<ref>Maharil (responsa 94) bemoans the fact that many people think that it is sufficient to have one mezuzah per house when in fact every doorway requires its own mezuzah. The Darkei Moshe 286:4 cites the Maharil. Kitzur Shulchan Aruch 11:1 concurs.</ref>
#Double doors with or without a poll in between is considered a single doorway and needs only one mezuzah on the right.<ref>Rashba (teshuva 4:91) writes that double doors with a poll in the middle, with the doors that are attached to the poll in the middle should have two mezuzot, but if they're attached to the side doorposts it should have one mezuzah since the poll in the middle is only for decoration and not to create two doorways. Shulchan Aruch Y.D. 286:21 codifies the Rashba. The Tur Y.D. 286:21, although similar in formulation to the Rashba, writes that if there is a single door that opens for two doorways it only needs one mezuzah, implying that if there are two doors that can open separately they need two mezuzot. [https://hebrewbooks.org/pdfpager.aspx?req=14428&st=&pgnum=49 Yad Ketana ch. 3 fnt. 9] makes this point but finds the opinion of the Tur very difficult to sustain in this case since the door functions as one doorway. He concludes that we follow the Rashba and Shulchan Aruch in that case and one mezuzah suffices.</ref>
#The doorpost of a cellar that is [[lying]] flat on the ground is not obligated in having a mezuzah.<ref>Chaye Adam 15:15 writes that a cellar door on the floor is exempt from mezuzah based on Kiddushin 22b that states that a doorpost lying on the ground isn't considered a doorpost. Kitzur Shulchan Aruch 11:20 and Aruch Hashulchan YD 286:41 concur.</ref>
===Accordion Door===
#An emergency exit or any door only used to exit is not obligated in a mezuzah.<ref>Minchat Shlomo 2:100:5</ref>
# An accordion door where the accordion door opens to the left certainly should have a mezuzah on the right doorpost. If the door opens to the right or both sides if after folding the door there is a tefach between the post and the area of passage, some hold that it is necessary to set up a new post next to the end of where the door folds, some hold it is exempt, and the minhag is to put the mezuzah on the right doorpost.<ref>[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 14)]</ref>
 
===Revolving Door===
===Minimum Size of Room===
# A revolving door should have a mezuzah on the right side whether the revolving door turns counter-clockwise or clockwise.<ref>[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 7)]</ref>
[[Image:T shaped room.png|200px|right]]
 
#A doorway is only obligated in a mezuzah if the room has 4 by 4 [[amot]] of space. If there's not 4 by 4 square [[amot]] but there is the same amount of area, such as 2 by 8 [[amot]], there is a dispute whether the doorway is obligated in a mezuzah. In such a case one should put up a mezuzah without a bracha, or recite a bracha when putting up a mezuzah in a doorway that is obligated and then put up this mezuzah.<ref>Kitzur Shulchan Aruch 11:10 records a dispute between the Rambam and Rosh on this matter. Shulchan Aruch YD 286:13 writes the opinion of the Rambam that if the room has an area of 4 by 4 [[amot]] even if it isn't a square it is obligated in a mezuzah. The Shach 286:23 notes that the opinion of the Rosh is that the doorway isn't obligated unless there is a 4 by 4 [[amot]] square area. Due to this dispute, the Shach concludes that one should put up the mezuzah without a bracha or recite a bracha when putting up a mezuzah in a doorway that is obligated and then put up this mezuzah. Binyan Tzion 99 follows Shulchan Aruch.</ref>
#If a room is four by four amot even if there large items such as a refrigerator or oven in that room and it is normally there and enables the room to be used normally it is obligated in a mezuzah.<ref>Mezuzah Vehilchoteha 9:3 writes that if there are large items in a room such as a refrigerator or oven they don't minimize the space of the room and count towards the four by four amot since they are normally there and enhance the use of the room. His sources include: Halichot Olam v. 8 p. 285, Maharsham 3:263, Shevet Halevi 2:187, and Chovat Hadar 4 fnt. 22. Chut Shani p. 83 suggests that the cabinets do not minimize the space since they aid use of the kitchen. He is certain though that the refrigerator and oven which are moveable do not minimize the space. Even the oven which is attached to a gas line doesn't minimize the space since it is moveable within the kitchen.</ref>
#A room in the shape of a T or L is obligated in a mezuzah if has an area of a rectangle of 16 square amot (either areas A, B, and C OR B and D in picture). If there is only 16 square amot of area when total the area of the shape it is a dispute if it is obligated in a mezuzah.<ref>Chazon Ish YD 169:6 learns from Eruvin 88b that for the Rambam two rooms that adjacent and only overlap in one area they combine for the requisite measure for mezuzah. Agur Bohalecha 18:9 cites this but disagrees. He holds that only a rectangle combines for the Rambam but not a L or T shape, but also cites in the opinion of the Chazon Ish. Chovat Hadar (ch. 4 fnt. 17) cites this Chazon Ish.</ref>
 
===Only One Doorpost===
<center><gallery>
one-doorpost.png|Picture #1:End of wall on right side functions as right doorpost
Small into big with no right side.png|Picture #2: End of wall on left side without a right doorpost
</gallery></center>
 
#If a doorway only has one doorpost, such as if the lintel is connected to a wall, then if the standing doorpost is on the right (picture #1), one should put up a mezuzah without a bracha or recite a bracha when putting up a mezuzah in a doorway that is obligated and then put up this mezuzah. If the standing doorpost is on the left (picture #2), that doorway isn't obligated in a mezuzah.<ref>The Shulchan Aruch Y.D. 287:1 writes that a doorway is only obligated in a mezuzah if it has two doorposts and a lintel. Shach 287:1 quotes the Rosh and Rabbenu Yerucham who are strict if there's one doorpost on the right side and concludes that one should put up a mezuzah in such a case without a bracha. Kitzur Shulchan Aruch 11:11, Yalkut Yosef Sovah Semachot p. 546 no. 19, and HaMezuzah VeHilchoteha 10:4 agree.</ref>
<center><gallery>
Left corner right end of wall.png|Picture #3: Room with right doorpost as end of wall
Right corner left end of wall.png|Picture #4: Room with left doorpost as end of wall
</gallery></center>
 
#If the left doorpost is the end of a wall that extends to the left and the right doorpost is the end of a wall (picture #3) that is considered as though there is a right doorpost without a left one and one should put up a mezuzah without a bracha.<ref>Chovat Hadar 7:7 in fnt.</ref> Others hold that this case is exempt altogether.<ref>Avnei Yishpa 3:95:1 based on Mikdash Me'at 287:3-4</ref>
#If the right doorpost is the end of a wall that extends to the right and the left doorpost is the end of a wall (picture #4) that is considered as though there is a left doorpost without a right one and the entrance is completely exempt from a mezuzah.<ref>Chovat Hadar 7:7 in fnt.</ref>
 
===No Lintel===
<center><gallery>
has-mashkof.png|Picture #1: Door with two posts and lintel
no-mashkof.png|Picture #2: Door with two posts and no lintel
</gallery></center>
 
#A regular doorway has two doorposts and a lintel (picture #1). If the doorway has two doorposts and there is no lintel but the area has a roof (picture #2), if the roof comes to an edge at the point of the door some say that one should put up a mezuzah, while others hold that doesn't require a mezuzah. Therefore, a mezuzah should be put up without a bracha.<ref>Shulchan Aruch Y.D. 287:1 writes that a door isn't obligated in a mezuzah unless the doorway has a lintel. Shulchan Aruch implies that a roof isn't a lintel. Accordingly, the Chazon Ish YD 172:3 s.v. mah writes that if the lintel doesn't extend downward to block part of the opening it isn't considered a lintel but just part of the roof. Shevet Halevi 2:150 agrees and proves this from Rashi Menachot 33b s.v. achsadra. This is also the ruling of Rav Moshe Heinemann (Guide to Halachos v. 1 p. 100).
 
*However, the [http://www.hebrewbooks.org/pdfpager.aspx?req=37191&pgnum=18 Mikdash Me'at 287:1:5] suggests that perhaps a roof can function as a lintel. Also, the Chovat Hadar 7:5 fnt. 8 equates the issue with that of having the edge of a roof function as a lintel to the opinion of the Rosh who holds that the edge of a wall can function as a doorpost. The Netivot in [http://www.hebrewbooks.org/pdfpager.aspx?req=31812&st=&pgnum=49 Derech Hachaim Siddur 239:1] also holds that a roof can serve as a lintel. Minchat Yitzchak 10:91 explains that a roof doesn't function as a lintel but if the roof has an edge where the door is, according to some opinions, it functions as a lintel. Yet, if the roof extends beyond the door in both directions it doesn't function as a lintel. He compares it to the dispute between the Rama 630:2 and Magen Avraham 630:2 if there's doorposts and no lintel if that can serve as a tzurat hapetach. He admits that it seems not to be a proof though from further analysis. Yalkut Yosef (Sova Somachot v. 1, Mekomot Hachayavim n. 16) agrees.
*Adoney Paz 2:121:1 sides with the Chazon Ish though he recommends being strict for all opinions to put up a mezuzah without a bracha. Mezuzah Vehilchoteha 10:3 concurs.
*Chazon Ish 172:2 in explaining the Ravyah writes that having two posts making the part of the roof to be like a recognizable lintel since the posts are recognizable. Then he compares it to the opinion of the Rosh that the end of a wall can function as a post. If so, it seems just like we're strict for the Rosh we should follow the Ravyah. This is the opinion of the Agur Bohalecha. However, the Chazon Ish 172:3 implies that the halacha is you need a recognizable lintel to be obligated like the Riaz against the Ravyah. Minchat Yitzchak rejects the proof from the Ravyah based on the Eliya Rabba that is only relevant to sukkah.</ref>
 
===Small Room Opening into Big Room===
<center><gallery>
Big into small.png|Picture #1: Normal way to walk is from the big room into the small room
Room to hallway.png|Picture #1*: Wide room that leads into hallway
Small into big.png|Picture #2: Normal way to walk is from the small room into the big room
Hallway to room.png|Picture #2*: Hallway that leads into wide room
</gallery></center>
 
#If the big room is an entrance into the small room (picture #1), if that entrance is created by the ends of walls and not doorposts, some poskim hold that the entrance is exempt from mezuzah.<ref>Chovat Hadar 7:7, Agur Bohalecha 21:25. Avnei Yishpa 3:95:1 quotes Rav Elyashiv as holding that it is exempt from a mezuzah. His reasoning is that the ends of the walls of the big room aren't doorposts for the small room since they are really one wall with a break. The end of a wall serving as a doorpost is only if there's no continuation of that wall on the opposite side continuing the wall.</ref> Some disagree.<ref>Chut Shani (Mezuzah p. 107) holds that it is obligated to put up a mezuzah with a bracha since from the inside of the big room it is recognizable as a doorway. Pitchei Mezuzot p. 154-5 holds that it requires a mezuzah according to the Rosh since it is the end of a wall and can be seen as a doorpost. According to him, it doesn't matter if it is from the small room to the big room or otherwise. Pitchei Shaarim 287:1:12 p. 215 agrees.</ref> To avoid the dispute one should put up a mezuzah without a bracha.<ref>[https://www.hebrewbooks.org/pdfpager.aspx?req=49139&pgnum=122 Keviyut Mezuzah Khilchata 9:11] writes that this case of a big room into a small room is a big dispute and unresolved one should put up a mezuzah there without a bracha. Madanei Asher (Mezuzah 30:3 p. 88) agrees.</ref>
#If the small room is an entrance into the big room (picture #2)<ref>Another picture of this case can be found [https://www.hebrewbooks.org/pdfpager.aspx?req=49139&pgnum=430 in Keviyut Mezuzah Khilchata p. 430].</ref> that entrance is obligated even if the doorpost is created by the ends of the walls.<ref>Chovat Hadar 7:7 writes that if there's a small room which opens into a big room if the big room is an entrance to the small room it is considered exempt. If the small room is an entrance to the big room it is obligated since the walls of the big room serve as the mezuzot for the entrance going into the big room. Chut Shani (Mezuzah p. 107) originally writes that this is exempt but then seems to agree that it is obligated to put up a mezuzah. Pitchei Shaarim 287:1:12 p. 215 agrees.</ref> Other argue that it is exempt from having a mezuzah.<ref>Agur Bohalecha 21:26. Avnei Yishpa 3:95:1 says that it is clearly exempt since there are no noticeable doorposts from inside the small room. [https://www.hebrewbooks.org/pdfpager.aspx?req=49139&pgnum=122 Keviyut Mezuzah Khilchata 9:11] writes that this case of a small room into a big room is an unresolved question and should have a mezuzah without a bracha. Madanei Asher (Mezuzah 30:3 p. 88) agrees. Madenei Asher cites Maaseh Nissim ch. 24 who says that in the Ben Ish Chai's house he didn't have a mezuzah on a room that was just three walls and the fourth was completely open  (e.g. [https://he.wikipedia.org/wiki/%D7%9C%D7%99%D7%95%D7%95%D7%90%D7%9F#/media/%D7%A7%D7%95%D7%91%D7%A5:Liwan-He.png]), though he is puzzled about why he didn't put up a mezuzah in light of Ben Ish Chai (Ki Tavo n. 13).</ref>
 
===Screen Door Before the Front Door===
 
#If there are two doorframes one in front of the other if they're within 1 amah of each other it is considered one doorway and one mezuzah on the outermost tefach suffices. However, if there is a space of more than 1 amah, they each require a separate mezuzah.<ref>Chovat Hadar 8:3:1 fnt. 3 writes that if there are two doorframes one in front of the other if they're within 1 amah of each other it is considered one doorway and one mezuzah on the outermost tefach suffices. However, if there is a space of more than 1 amah, they each require a separate mezuzah. Shaarei Hamezuzah 12:8 agrees. Hatorah Vehamitzvah (v. 2 ch. 137 pp. 611-612) distinguishes whether or not it is possible to use the area between the doorways in which case it is two doorframes, otherwise it is one long entrance and only one mezuzah is necessary.</ref>


==Type of Rooms and Buildings==
===Closets, Pantries, and Storage Rooms===
===Closets, Pantries, and Storage Rooms===
#A doorway is usually obligated in a mezuzah if it has two doorposts that are 10 [[Tefachim]] tall and a lintel on top.<ref>Shulchan Aruch YD 287:1, Kitzur Shulchan Aruch 11:11</ref> Here an exception:
#A doorway is usually obligated in a mezuzah if it has two doorposts that are 10 [[Tefachim]] tall and a lintel on top.<ref>Shulchan Aruch YD 287:1, Kitzur Shulchan Aruch 11:11</ref> Here an exception:
#A small closet, such as a linen closet or electricity closet, that a person doesn't enter and only uses by takes things out of it isn't obligated in a mezuzah. However, if it is a large closet that is 4 by 4 [[amot]] and a person enters is obligated in a mezuzah without a bracha.<ref>Pitchei [[Mezuzot]] 19:10-1 (p. 257), Minchat Yitzchak 3:103, 4:92:3, [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 60)] </ref>
#A small closet, such as a linen closet or electricity closet, that a person doesn't enter and only uses by takes things out of it isn't obligated in a mezuzah. However, if it is a large closet that is 4 by 4 [[amot]] and a person enters is obligated in a mezuzah without a bracha.<ref>Pitchei [[Mezuzot]] 19:10-1 (p. 257), Minchat Yitzchak 3:103, 4:92:3, [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 60)] </ref>
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===Summer House===
===Summer House===
[[Image:porch.jpg|100px|right]]


#There is an obligation to put up a mezuzah on a summer home or any home that is lived in even for part of the year. <ref>Yoma 11a, Shitah Mikubeset b”m 102, [http://www.yutorah.org/sidebar/lecture.cfm/788640/rabbi-hershel-schachter/the-laws-of-mezuzah/ Rav Hershel Schachter in “The Laws of Mezuzah” (min 0-2)]</ref>
#There is an obligation to put up a mezuzah on a summer home or any home that is lived in even for part of the year. <ref>Yoma 11a, Shitah Mikubeset b”m 102, [http://www.yutorah.org/sidebar/lecture.cfm/788640/rabbi-hershel-schachter/the-laws-of-mezuzah/ Rav Hershel Schachter in “The Laws of Mezuzah” (min 0-2)]</ref>
Line 120: Line 74:
#The door to the stairwell should also have a mezuzah.<ref>[https://www.yeshiva.org.il/ask/111844 Rav Yaakov Ariel]</ref>
#The door to the stairwell should also have a mezuzah.<ref>[https://www.yeshiva.org.il/ask/111844 Rav Yaakov Ariel]</ref>


===Double Doors===
===Inner Rooms===
[[Image:Double doors with poll.jpg|200px|right]]
#Every doorway of one's house is obligated in mezuzah. Even if a room has several doorways, each one is obligated in having a mezuzah. If a doorway isn't used for entering it doesn't need a mezuzah.<ref>Maharil (responsa 94) bemoans the fact that many people think that it is sufficient to have one mezuzah per house when in fact every doorway requires its own mezuzah. The Darkei Moshe 286:4 cites the Maharil. Kitzur Shulchan Aruch 11:1 concurs.</ref>
===Cellar Doors===
#The doorpost of a cellar that is lying flat on the ground is not obligated in having a mezuzah.<ref>Chaye Adam 15:15 writes that a cellar door on the floor is exempt from mezuzah based on Kiddushin 22b that states that a doorpost lying on the ground isn't considered a doorpost. Kitzur Shulchan Aruch 11:20 and Aruch Hashulchan YD 286:41 concur.</ref>
===Emergency Exits===
#An emergency exit or any door only used to exit is not obligated in a mezuzah.<ref>Minchat Shlomo 2:100:5</ref>
 
==Structure of Doorframe and Room==
 
===Minimum Size of Room===
[[Image:T shaped room.png|200px|right]]
#A doorway is only obligated in a mezuzah if the room has 4 by 4 [[amot]] of space. If there's not 4 by 4 square [[amot]] but there is the same amount of area, such as 2 by 8 [[amot]], there is a dispute whether the doorway is obligated in a mezuzah. In such a case one should put up a mezuzah without a bracha, or recite a bracha when putting up a mezuzah in a doorway that is obligated and then put up this mezuzah.<ref>Kitzur Shulchan Aruch 11:10 records a dispute between the Rambam and Rosh on this matter. Shulchan Aruch YD 286:13 writes the opinion of the Rambam that if the room has an area of 4 by 4 [[amot]] even if it isn't a square it is obligated in a mezuzah. The Shach 286:23 notes that the opinion of the Rosh is that the doorway isn't obligated unless there is a 4 by 4 [[amot]] square area. Due to this dispute, the Shach concludes that one should put up the mezuzah without a bracha or recite a bracha when putting up a mezuzah in a doorway that is obligated and then put up this mezuzah. Binyan Tzion 99 follows Shulchan Aruch.</ref>
#If a room is four by four amot even if there large items such as a refrigerator or oven in that room and it is normally there and enables the room to be used normally it is obligated in a mezuzah.<ref>Mezuzah Vehilchoteha 9:3 writes that if there are large items in a room such as a refrigerator or oven they don't minimize the space of the room and count towards the four by four amot since they are normally there and enhance the use of the room. His sources include: Halichot Olam v. 8 p. 285, Maharsham 3:263, Shevet Halevi 2:187, and Chovat Hadar 4 fnt. 22. Chut Shani p. 83 suggests that the cabinets do not minimize the space since they aid use of the kitchen. He is certain though that the refrigerator and oven which are moveable do not minimize the space. Even the oven which is attached to a gas line doesn't minimize the space since it is moveable within the kitchen.</ref>
#A room in the shape of a T or L is obligated in a mezuzah if has an area of a rectangle of 16 square amot (either areas A, B, and C OR B and D in picture). If there is only 16 square amot of area when total the area of the shape it is a dispute if it is obligated in a mezuzah.<ref>Chazon Ish YD 169:6 learns from Eruvin 88b that for the Rambam two rooms that adjacent and only overlap in one area they combine for the requisite measure for mezuzah. Agur Bohalecha 18:9 cites this but disagrees. He holds that only a rectangle combines for the Rambam but not a L or T shape, but also cites in the opinion of the Chazon Ish. Chovat Hadar (ch. 4 fnt. 17) cites this Chazon Ish.</ref>
 
===Only One Doorpost===
<center><gallery>
one-doorpost.png|Picture #1:End of wall on right side functions as right doorpost
Small into big with no right side.png|Picture #2: End of wall on left side without a right doorpost
</gallery></center>
#If a doorway only has one doorpost, such as if the lintel is connected to a wall, then if the standing doorpost is on the right (picture #1), one should put up a mezuzah without a bracha or recite a bracha when putting up a mezuzah in a doorway that is obligated and then put up this mezuzah. If the standing doorpost is on the left (picture #2), that doorway isn't obligated in a mezuzah.<ref>The Shulchan Aruch Y.D. 287:1 writes that a doorway is only obligated in a mezuzah if it has two doorposts and a lintel. Shach 287:1 quotes the Rosh and Rabbenu Yerucham who are strict if there's one doorpost on the right side and concludes that one should put up a mezuzah in such a case without a bracha. Kitzur Shulchan Aruch 11:11, Yalkut Yosef Sovah Semachot p. 546 no. 19, and HaMezuzah VeHilchoteha 10:4 agree.</ref>
<center><gallery>
Left corner right end of wall.png|Picture #3: Room with right doorpost as end of wall
Right corner left end of wall.png|Picture #4: Room with left doorpost as end of wall
</gallery></center>
#If the left doorpost is the end of a wall that extends to the left and the right doorpost is the end of a wall (picture #3) that is considered as though there is a right doorpost without a left one and one should put up a mezuzah without a bracha.<ref>Chovat Hadar 7:7 in fnt.</ref> Others hold that this case is exempt altogether.<ref>Avnei Yishpa 3:95:1 based on Mikdash Me'at 287:3-4</ref>
#If the right doorpost is the end of a wall that extends to the right and the left doorpost is the end of a wall (picture #4) that is considered as though there is a left doorpost without a right one and the entrance is completely exempt from a mezuzah.<ref>Chovat Hadar 7:7 in fnt.</ref>
 
===No Lintel===
<center><gallery>
has-mashkof.png|Picture #1: Door with two posts and lintel
no-mashkof.png|Picture #2: Door with two posts and no lintel
</gallery></center>
#A regular doorway has two doorposts and a lintel (picture #1). If the doorway has two doorposts and there is no lintel but the area has a roof (picture #2), if the roof comes to an edge at the point of the door some say that one should put up a mezuzah, while others hold that doesn't require a mezuzah. Therefore, a mezuzah should be put up without a bracha.<ref>Shulchan Aruch Y.D. 287:1 writes that a door isn't obligated in a mezuzah unless the doorway has a lintel. Shulchan Aruch implies that a roof isn't a lintel. Accordingly, the Chazon Ish YD 172:3 s.v. mah writes that if the lintel doesn't extend downward to block part of the opening it isn't considered a lintel but just part of the roof. Shevet Halevi 2:150 agrees and proves this from Rashi Menachot 33b s.v. achsadra. This is also the ruling of Rav Moshe Heinemann (Guide to Halachos v. 1 p. 100).
*However, the [http://www.hebrewbooks.org/pdfpager.aspx?req=37191&pgnum=18 Mikdash Me'at 287:1:5] suggests that perhaps a roof can function as a lintel. Also, the Chovat Hadar 7:5 fnt. 8 equates the issue with that of having the edge of a roof function as a lintel to the opinion of the Rosh who holds that the edge of a wall can function as a doorpost. The Netivot in [http://www.hebrewbooks.org/pdfpager.aspx?req=31812&st=&pgnum=49 Derech Hachaim Siddur 239:1] also holds that a roof can serve as a lintel. Minchat Yitzchak 10:91 explains that a roof doesn't function as a lintel but if the roof has an edge where the door is, according to some opinions, it functions as a lintel. Yet, if the roof extends beyond the door in both directions it doesn't function as a lintel. He compares it to the dispute between the Rama 630:2 and Magen Avraham 630:2 if there's doorposts and no lintel if that can serve as a tzurat hapetach. He admits that it seems not to be a proof though from further analysis. Yalkut Yosef (Sova Somachot v. 1, Mekomot Hachayavim n. 16) agrees.
*Adoney Paz 2:121:1 sides with the Chazon Ish though he recommends being strict for all opinions to put up a mezuzah without a bracha. Mezuzah Vehilchoteha 10:3 concurs.
*Chazon Ish 172:2 in explaining the Ravyah writes that having two posts making the part of the roof to be like a recognizable lintel since the posts are recognizable. Then he compares it to the opinion of the Rosh that the end of a wall can function as a post. If so, it seems just like we're strict for the Rosh we should follow the Ravyah. This is the opinion of the Agur Bohalecha. However, the Chazon Ish 172:3 implies that the halacha is you need a recognizable lintel to be obligated like the Riaz against the Ravyah. Minchat Yitzchak rejects the proof from the Ravyah based on the Eliya Rabba that is only relevant to sukkah.</ref>
 
===Small Room Opening into Big Room===
<center><gallery>
Big into small.png|Picture #1: Normal way to walk is from the big room into the small room
Room to hallway.png|Picture #1*: Wide room that leads into hallway
Small into big.png|Picture #2: Normal way to walk is from the small room into the big room
Hallway to room.png|Picture #2*: Hallway that leads into wide room
</gallery></center>
#If the big room is an entrance into the small room (picture #1), if that entrance is created by the ends of walls and not doorposts, some poskim hold that the entrance is exempt from mezuzah.<ref>Chovat Hadar 7:7, Agur Bohalecha 21:25. Avnei Yishpa 3:95:1 quotes Rav Elyashiv as holding that it is exempt from a mezuzah. His reasoning is that the ends of the walls of the big room aren't doorposts for the small room since they are really one wall with a break. The end of a wall serving as a doorpost is only if there's no continuation of that wall on the opposite side continuing the wall.</ref> Some disagree.<ref>Chut Shani (Mezuzah p. 107) holds that it is obligated to put up a mezuzah with a bracha since from the inside of the big room it is recognizable as a doorway. Pitchei Mezuzot p. 154-5 holds that it requires a mezuzah according to the Rosh since it is the end of a wall and can be seen as a doorpost. According to him, it doesn't matter if it is from the small room to the big room or otherwise. Pitchei Shaarim 287:1:12 p. 215 agrees.</ref> To avoid the dispute one should put up a mezuzah without a bracha.<ref>[https://www.hebrewbooks.org/pdfpager.aspx?req=49139&pgnum=122 Keviyut Mezuzah Khilchata 9:11] writes that this case of a big room into a small room is a big dispute and unresolved one should put up a mezuzah there without a bracha. Madanei Asher (Mezuzah 30:3 p. 88) agrees.</ref>
#If the small room is an entrance into the big room (picture #2)<ref>Another picture of this case can be found [https://www.hebrewbooks.org/pdfpager.aspx?req=49139&pgnum=430 in Keviyut Mezuzah Khilchata p. 430].</ref> that entrance is obligated even if the doorpost is created by the ends of the walls.<ref>Chovat Hadar 7:7 writes that if there's a small room which opens into a big room if the big room is an entrance to the small room it is considered exempt. If the small room is an entrance to the big room it is obligated since the walls of the big room serve as the mezuzot for the entrance going into the big room. Chut Shani (Mezuzah p. 107) originally writes that this is exempt but then seems to agree that it is obligated to put up a mezuzah. Pitchei Shaarim 287:1:12 p. 215 agrees.</ref> Other argue that it is exempt from having a mezuzah.<ref>Agur Bohalecha 21:26. Avnei Yishpa 3:95:1 says that it is clearly exempt since there are no noticeable doorposts from inside the small room. [https://www.hebrewbooks.org/pdfpager.aspx?req=49139&pgnum=122 Keviyut Mezuzah Khilchata 9:11] writes that this case of a small room into a big room is an unresolved question and should have a mezuzah without a bracha. Madanei Asher (Mezuzah 30:3 p. 88) agrees. Madenei Asher cites Maaseh Nissim ch. 24 who says that in the Ben Ish Chai's house he didn't have a mezuzah on a room that was just three walls and the fourth was completely open  (e.g. [https://he.wikipedia.org/wiki/%D7%9C%D7%99%D7%95%D7%95%D7%90%D7%9F#/media/%D7%A7%D7%95%D7%91%D7%A5:Liwan-He.png]), though he is puzzled about why he didn't put up a mezuzah in light of Ben Ish Chai (Ki Tavo n. 13).</ref>


#Double doors with or without a poll in between is considered a single doorway and needs only one mezuzah on the right.<ref>Rashba (teshuva 4:91) writes that double doors with a poll in the middle, with the doors that are attached to the poll in the middle should have two mezuzot, but if they're attached to the side doorposts it should have one mezuzah since the poll in the middle is only for decoration and not to create two doorways. Shulchan Aruch Y.D. 286:21 codifies the Rashba. The Tur Y.D. 286:21, although similar in formulation to the Rashba, writes that if there is a single door that opens for two doorways it only needs one mezuzah, implying that if there are two doors that can open separately they need two mezuzot. [https://hebrewbooks.org/pdfpager.aspx?req=14428&st=&pgnum=49 Yad Ketana ch. 3 fnt. 9] makes this point but finds the opinion of the Tur very difficult to sustain in this case since the door functions as one doorway. He concludes that we follow the Rashba and Shulchan Aruch in that case and one mezuzah suffices.</ref>
===Screen Door Before the Front Door===
===Accordion Door===
#If there are two doorframes one in front of the other if they're within 1 amah of each other it is considered one doorway and one mezuzah on the outermost tefach suffices. However, if there is a space of more than 1 amah, they each require a separate mezuzah.<ref>Chovat Hadar 8:3:1 fnt. 3 writes that if there are two doorframes one in front of the other if they're within 1 amah of each other it is considered one doorway and one mezuzah on the outermost tefach suffices. However, if there is a space of more than 1 amah, they each require a separate mezuzah. Shaarei Hamezuzah 12:8 agrees. Hatorah Vehamitzvah (v. 2 ch. 137 pp. 611-612) distinguishes whether or not it is possible to use the area between the doorways in which case it is two doorframes, otherwise it is one long entrance and only one mezuzah is necessary.</ref>
# An accordion door where the accordion door opens to the left certainly should have a mezuzah on the right doorpost. If the door opens to the right or both sides if after folding the door there is a tefach between the post and the area of passage, some hold that it is necessary to set up a new post next to the end of where the door folds, some hold it is exempt, and the minhag is to put the mezuzah on the right doorpost.<ref>[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 14)]</ref>
===Revolving Door===
# A revolving door should have a mezuzah on the right side whether the revolving door turns counter-clockwise or clockwise.<ref>[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 7)]</ref>


==Doorway in a Room==
==Doorway in a Room==
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