An oven whose opening is vented outdoors is located inside a house and pallbearers pass over [the opening] — Beis Shammai say: Everything becomes tamei. Beis Hillel say: The oven becomes tamei, but the house remains tahor. R’ Akiva says: Even the oven remains tahor.

There is an opening between the lower story and the upper story of a house that has been covered by a pot. [The pot has] a crack large enough for liquid to seep in. Beis Shammai say: Everything [in the house] becomes tamei. Beis Hillel say: The pot becomes tamei, but the upper story remains tahor. R’ Akiva says: Even the pot re-mains tahor.