Is it a problem that my furnace filter is loose in its slot?

FurnaceAir Filter Cover furnace filter slot cover Buy AllergyZone FilterLock Furnace Filter Slot Seal Door Cover at furnace filter slot cover Measure the return air duct depth in inches as well as the height and width of the opening where your air filter slots in Once you have these dimensions, round

moneytrain 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