Return Air Box -

74846 Southwark FB Furnace Support Box with Filter Slot, 20 x 25 x 1 Inch, 21 Inch W x 18 -12 Inch H Ready To Ship! 17 In Stock Now! Check

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return to paris slot a return air box : this is just a big sheet metal box that you set slot to hold the air filter a supply air plenum to handle the

return air box with filter slot a return air box : this is just a big sheet metal box that you set slot to hold the air filter a supply air plenum to handle the