Insulate a mail slot

5 Tips to Keep Your Door Mail Slot Secure door mail slot cover Slot opening is 11 wide x 2 high Specifications Operating Temperatures, Door Cutout: 11-12 wide x 2-1116 high WiFi compatibility, Mail Slot Screw door slot lock Mail Slot enables mail to be delivered right to the door The mail slot cover · mail sorter · parcel drop box · through wall mail slot · vertical mail slots

door mail slot collection box You can remove the slot and cover up the opening on both sides with one of these plates We did in our old house report