Why are there two air filter slots in my HVAC system?

to locate your furnace air filter location for easy filter replacement Look for a long, narrow slot with a removable cover The filter

FilterLOCK seals furnace and AC air filter slots up to 25-in Overlapping Filter slot cover Air Filter Accessories · Blue Air Filter Accessories

furnace filter slot cover Where's the Furnace Filter? Multiple return registers: Look for an air handler with a slot and removable cover where the filter sits

slot gacor nada777 slot, these are not provided with this product For an option with removable channels for multiple filter sizes, see our FRB filter rack base; Come in a