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gotcha: the door has about 186 in2 then. the door itself is not tightly sealed as well, open spaces at the top and bottom.

the slatted door is 66x24 (1584 in2), the air filter is 16x24 (384 in2)

my house is one level, on a concrete slab, open floor plan (big open room, few doors), forced air heating/cooling (i believe). house inspector said i needed to have cold air returns. my furnace is located in a utility room with a completely slatted door. could someone explain why i would...