AllergyZone FilterLock Furnace Filter Slot Seal Door Cover, 12x4

Learn why an open furnace filter slot is detrimental to the health of your HVAC system and your family, and how to easily fix it

Dumb idea #1: Put a series of machine screws along the duct opposite of the filter slot The filter should push against them when air is flowing

furnace filter slot cover 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

crazy 7 slot game I just had the air intake on my furnace expanded, but they didn't update the filter slot Is it acceptable for a forced air furnace filter to