What is the minimum size of a functional window (made for use) for impurity to pass through?
Halacha 1: A window made for functional purposes (tashimish) requires one handbreadth by one handbreadth for impurity to pass through to the other structure.
Question 2
What size must a light window (made for illumination) be for impurity to pass through it?
Halacha 1: A window specifically made for light (ma'or) only requires the size of a pundiyon for impurity to pass through and emerge from the house.
Question 3
A hole formed by water erosion in a wall — what size allows impurity to pass through?
Halacha 2: A window formed naturally (not by human action) requires the size of a full fist (rosh adam). However, if the owner decided to use it functionally, thought alone changes its threshold to a handbreadth.
Question 4
A person makes a hole in a wall to peek at passersby. What is the minimum size for impurity to pass through?
Halacha 7: A hole made in a wall for purposes like inserting a rod, seeing passersby, or speaking to a neighbor is treated as a functional window — requiring a handbreadth by a handbreadth.
Question 5
A large light window is covered by a lattice whose holes are all smaller than a pundiyon. Does impurity pass through?
Halacha 4: If the holes of the lattice are all small and none is the size of a pundiyon, it is considered closed — the holes are not combined. If even one opening is a pundiyon size, impurity passes through.