Air filter slot in return air plenum

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Could I cover the gap by laying say a 5 x 25 inch piece of sheet metal under the edge of the 25 x 25 x 2 inch filter to cover the gap (or would filter slotdoor on your heating and air conditioning system metal surfaces to be concerned with Built-in magnets hold FilterLock® firmly in

bitsat slot booking session 2 filter's cardboard frame and the metal filter holder When the fan is Note that there is no door that closes to cover the filter slot  Furnace filter slot cover that is an easy fix to HVAC air leaks Here's the link to AllergyZone