AllergyZone Filter Lock Magnetic Filter SealCover Air Filter Opening

The filter is placed in the return air grill

Improves indoor air quality; Saves energy; Fits up to 25” opening; Residential or Commercial construction; Magnetic; Covers 1 or 2 wide filters Installation

air 138 slot Furnace filter slot cover that is an easy fix to HVAC air leaks Here's the link to AllergyZone

airport slot machines covers the filter slotdoor to prevent entry of unfiltered air into your heating and air conditioning system