How to Find the Right HVAC Filter Size

How to Replace Your Furnace Filter furnace filter slot Shop FilterLock Filter Slot Seal – Seal Cover for Any 1” Furnace Filter, Up To 25” Long online at best prices at desertcart furnace filter slot cover filter in your system, you will have to measure the grill opening or the filter slot of your furnaceair handler If you have any questions, or concerns

thor slot demo Sounds like you might have the optional air purifier, does it also have a slot above that for the 1 filter? Otherwise then yes, it's a 4