AllergyZone FilterLock Furnace Filter Slot Seal

How to Measure Your Furnace or AC Filter furnace filter slot Reduce energy consumption & prevent harmful airborne pollutants from entering your home with FilterLock by AllergyZone Works with most 1 furnace filters furnace filter slot 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

euro slot The 1 filter slot in a typical furnace return has a pretty poor seal around the filter, which will let a certain amount of air just leak past