Use of open mail slots in a corridor

Use of open mail slots in a corridor mail slot through wall Since it is a corridor wall, the opening itself needs to be fire rated I'm looking for suggestions Most of the mail slots I find are more mail slot for door This through the wall mail slot is designed to accept standard mail, rent payments, or small parcels It can be used as a payment drop slot for rental offices

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mail slot in door This through the wall mail slot is designed to accept standard mail, rent payments, or small parcels It can be used as a payment drop slot for rental offices At Home with Lisa: Mail slots let mail in and air out One cool feature I I found a bag I can attach to the wall around the slot with Velcro It was