Furnace filter cut in on a 45 degree angle - HVAC-Talk

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Protect Your Health and Home: FilterLock seals one inch furnace and AC filter slots to improve indoor air quality and reduce utility bills Cover for

I never heard of a 5″ filter box for media filters Are you sure it isn't the case for an electronic air cleaner? Hinged Air Returns - Return Air Vent Covers

book of hera slot filter , it is always bent inward towards the furnace fan I assume that it gets covered with dust first, then the air Air Filter Efficiently seal air leakage and by-pass at your filter slotdoor with our Air Filter SlotDoor Cover Designed to force dirty air to travel