How to cover this mail slot up so cold air won't come in?

How to cover this mail slot up so cold air won't come in? mailbox slot cover Reproduction interior mail slot Matching exterior slot available 2 Finishes, Brass and Antique Pewter 8-12 length with a 5-34 width mailbox slot in wall The Mail Slot is designed and crafted to stand the test of time Made from solid brass parts and featuring premium finishes and mechanisms, each piece is

mailbox slot in wall We use them all the time for access panels, wall mail slot covers on the interior, etc and they come in many sizes Best of luck Like

mailbox slot for door cover this with since we moved in I've checked hardware stores and searched on the internet, but I haven't really found a good cover for these I finally cover It is important to keep the letter plate in good condition to ensure efficient mail delivery and prevent any potential issues that could compromise