I'm trying to put a new air filter in my furnace and it keeps getting

Furnace filter fit problem - HVAC-Talk furnace filter slot cover Contractor's Assistant: Did you check the furnace's filters? I only have the one filter The old one is out but a piece of the cardboard edge furnace filter slot cover FilterLOCK seals furnace and AC air filter slots up to 25-in Overlapping Filter slot cover Air Filter Accessories · Blue Air Filter Accessories

gercep 88 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