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MB3 118b: Closing a Door on Shabbos (313:3-4)
לעילוי נשמת יוסף ניסן בן יחזקאל ע"ה, Rabbi Glatt's father
Opening/closing on Shabbos A door that is very rarely used can be מחזי כבונה unless it has a hinge/pivot. An opening used regularly for exiting and entering, is not subject to מחזי כבונה.
Doors made of a single board vs. multiple boards.