Seal Cover for Any 1” Furnace Filter, Up To 25” Long

Furnace filter slot cover that is an easy fix to HVAC air leaks Here's the link to AllergyZone

Buy AllergyZone FilterLock Furnace Filter Slot Seal Door Cover, 1 at

furnace filter slot I just had the air intake on my furnace expanded, but they didn't update the filter slot In this case, you might have some recourse against

feel the beat slot The FilterLOCK covers and seals the standard 1” furnace filter slots The overlapping two-piece design allows for filter slots measuring up to 25” in width