Home AC Return Air Filter Grille Install

Is is common that there is a filter both at the return air intake AND at the furnace? slot for a filter if you choose to use intake

Return air filter plenum, 14x20 with end cap, and round 12 collar , hvac duct Brand New $ Free shipping 82 sold

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return to the feature slot Other places you may find the air filter are in a slot above or below your HVAC unit, or right behind the return grills in your home (see