Connects a downflow furnace to the ductwork underneath it. To specify the correct size, measure from the top of the floor to the top of the duct. Secure to floor and bend fingers inside duct opening. Opening size is 12″ x 14″. Total size is 18″ x 18″. Depths available are 2″, 4.5″, 6.5″, 7.5″, 8.5″, 10.25″, and 12″.
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