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

Furnace Filter Slot Cover [Easy fix to HVAC Air Leak with furnace filter slot cover filter each month in case heavy use caused your filter to clog up Step 3: Replace the filter by sliding a new, clean filter into the slot furnace filter slot 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

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