If the area surrounding your filter isn't completely sealed, air can be

If you can't find a filter slot on your HVAC unit, try looking in the vents that blow air into your rooms Some systems have filters in the return air vents

AllergyZone - FilterLock Filter Slot Seal – Seal Cover for Any 1” Furnace Filter, Up To 25” Long Protect Your HVAC System: FilterLock is a patented

furnace filter slot I'm trying to put a new air filter in my furnace and it keeps getting stuck on something and ripping the outside cover? What do I do?

summer bliss slot Whenever I change my furnace filter , it is always bent inward towards the furnace fan I assume that it gets covered