The Unico System® UPC-62-1218 Square Supply Air Plenum Adapter

The Unico System® Supply Air Plenum Adapter, Square, Series: UPC-62, Supply Air Plenum Adapter Adapter, 6-1/2 in Diameter, 8-1/2 in Length, 8-1/2 in Width, For Use With: Model M1218 Blower Module and R4.2 Fiberglass Ductboard, Fiberglass