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If someone has a house which has a room, and this room has two doors without a "heker tzir" (1) (like salon doors, or sliding doors, or no doors at all) and people walk into this room through one door as often as the other.

In other words, where there is no "heker tzir" and no "ikar tashmisho" on which side of the door do you put the mezuza?

(1) [the position of the mezuzah] is determined by the door-hinge. - This principle is called heker tzir (Menachot 33a).

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It might be helpful if you define those terms (at least a quick summary) –  yydl Oct 4 '11 at 4:48
    
Where on the sliding door, do you put a mezuzah? –  user1437 Apr 26 '12 at 2:59
    
@joe, welcome to Judaism.SE! Please ask your question as its own question. –  Isaac Moses Apr 26 '12 at 3:04
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I'd like to see the question formulated differently. As it stands now, I think the most correct answer is CYLOR. –  Seth J Apr 26 '12 at 3:48
    
Actually, the question is fine (except that it asks for direct Halachic advice). The title, though, is "what should I do?" The answer to that is, "ask your rabbi." –  Seth J Apr 26 '12 at 14:04
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1 Answer

up vote 6 down vote accepted

When one has a door between two rooms there is a list of criteria to determine which side is considered the right side of the door. You should evaluate them in order. As soon as one is met, you have determined the right side and can ignore all of the rest of the list.

They are as follows:
1. Pnimi Chitzoni - That is to say, you consider it as if you enter from the room which is closer to the Reshut Harabim into the room which is further from the Reshut Harabim. If this is equal then...
2. Flow of traffic - We look at what is the most common pattern of people who use these rooms. If that is equal then..
3. "Shimush" - If one room is used more for "living" than the other, then the Mezuzah goes on the right as you enter that room. If that is equal then...
4. Heker Tzir - We put the Mezuzah on the right of the room into which the door opens. (It is interesting to note that according to the Chabad custom, you look at Heker Tzir first and only afterward to the other criteria.

If you have looked at all of these criteria in order and the two rooms are still equal (which is a case I have never yet come across) then there is a Machlokes as to what you would do.

According to the Mikdash M'at you would put it on whichever side you like (he holds that the Torah only said to put it on the right to rule out putting it on the left but here there is no clear left)

The Sh'elat Yaavetz and Shearei Deah hold that you would put a Mezuzah on each side. Although you might worry that this is Baal Tosif, they say that it is not a problem since you are doing it to rule out a safek and you only have intention for whichever one is the correct one.

You can find all of the details of this subject in the Sefer Chovat HaDar by Rabbi Yaakov Yeshaya Bloi.

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Could you please define Reshut Harabim? Thanks. –  Monica Cellio Oct 4 '11 at 12:51
    
Reshut Harabim means the public domain. In this context it basically means anything outside your house. –  Aaron Shaffier Oct 4 '11 at 15:42
    
I just wrote a more user friendly version of this answer on my blog here: mezuzahstore.com/blogs/mezuzah-blog/… –  Aaron Shaffier Oct 31 '11 at 19:52
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