Air filter slot in return air plenum

metal furnace filter slot cover
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Furnace Filter Slot Cover [Easy fix to HVAC Air Leak with One Hour Heating and Air

filter slot is almost always on this return air side (the suckie side, not the blowie side The built-in magnets attach Filter Lock to metal duct work and hold it securely in place out of 5 stars Filter Lock Furnace Filter Slot Cover Review -

how to play lottery ticket filter having a smooth end face and a large number of closely adjacent FURNACE John G Lewis , 1601 Leaird , Ann Arbor , Mich Original Whenever I change my furnace filter , it is always bent inward towards the furnace fan I assume that it gets covered