Closing up a window or door:[1]
One may not completely [and permanently[2]] close off a window or door, being that demons use openings to enter and exit and hence can lead to danger. Rather one must leave a small hole in the area. [The custom is to place a hollow tin can that is open from both ends within an area of the window or door, and the remaining area may then be closed up. So was the custom of the Tzemach Tzedek.[3]]
Q&A
How large must the hole be?[4]
The hole can be of any size.
May one cover over the hole:[5]
Yes. The hole may be covered over by any material that can be , so long as the hole remains hollow inside.
May one completely close up a door or window if there is another exit adjacent to it?[6]
No.[7]
May one close a window or door if he plans to leave it closed for a very long time?
Yes.
[1] Tzavah Yehuda Hachassid 20; Sefer Chassidim 461; 1146; brought in Kaf Hachaim 116/122
[2] However one may completely close off an opening for temporary basis, such as to close a window or door of a room, even if he plans to leave it closed for a very long time.
[3] Shivim Temarim 23 p. 60
[4] Shemiras Hanefesh p. 15
[5] Shivim Temarim 23 p. 60
[6] Sefer Chassidim 461; 1146
[7] The reason: As angels and demons only have permission to use a specific exit.
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