A projection that is above a doorway forms a passage for the uncleanness when it is one handbreadth wide; If above a window two fingerbreadths high or the size of a hole made by a drill, when of any width whatsoever. Rabbi Yose says: when of equal size [to the particular window].

A rod above a doorway, even if one hundred cubits higher, forms a passage for the uncleanness no matter its width, the words of Rabbi Joshua. Rabbi Yohanan ben Nuri says: don't be more stringent than the case of a projection.

[In the case of] a projection which goes all round the house, occupying space above the doorway to the extent of three fingerbreadths, if there is uncleanness in the house, vessels beneath [the projection] become unclean. If the uncleanness is beneath [the projection]: Rabbi Eliezer declares the house unclean, But Rabbi Joshua declares it clean. A similar [rule applies] to a courtyard surrounded by a portico.

[With regard to] two projections, one [directly] above the other, each having a width of one handbreadth and a space of one handbreadth between them: If there is uncleanness beneath them, what is beneath them becomes unclean; If it is between them, what is between them becomes unclean; Above them, everything directly [above] to the sky becomes unclean. If the upper [projection] overlapped the lower to the extent of one handbreadth: If there is uncleanness beneath or between them, what is beneath and between them becomes unclean; If it is above them, what is directly [above] to the sky becomes unclean. If the upper [projection] overlapped the lower to an extent of less than a handbreadth: If there is uncleanness beneath them, what is beneath and between them becomes unclean; If it is between them or beneath the overlapping [part]: Rabbi Eliezer says: what is beneath them and between them becomes unclean. Rabbi Joshua says: what is between them and beneath the overlapping [part] becomes unclean, but what is beneath [the lower one] remains clean.

If they had a width of a handbreadth but there was not a space of a handbreadth between them: If there is uncleanness beneath them, what is beneath becomes unclean; If it is between them or above them, everything directly [above] to the sky becomes unclean.

If they did not have a width of a handbreadth, whether there is a space of a handbreadth between them or whether there is not, if there is uncleanness beneath, between or above them, the uncleanness cleaves upwards and downwards. A similar [rule applies] to two curtains, [the lower one of which is] one handbreadth high off the ground.