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2000153 Smart Filter Seal Covers Up To 25 Furnace Filter Slot 1 or 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 filter slot I've considereddone blowing my rear fans inward across my CPUNorthbridge and putting filters on the outside of them, to PCI slot covers

slot cutting drill bit for metal FilterLock® by AllergyZone stops dirty, unfiltered air from entering your home through an open or poorly sealed air filter slotdoor on your heating and air