How to insulate mail slot in door?

If you decide to go that route, get a mailbox slot that can handle the winter cold air There is a company in Canada that makes an insulated box

Trimco 2091 Mail Slot Sleeve views · 4 years agomore Installation

crystal forest slot machine Attractive as they were, and still are, they were not insulated against the cold and air infiltration But they can be, though the solutions

transformers slot Installation instructions for an Elite Model DraftDodger™ Insulated Mail Slot