20" X 20" 20" X 20"Duct Board Reducer Box can used as a Tee Wye or Plenum Type Duct Box (Cut your o
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20" X 20" X 20" X 20" Duct Board Blind Reducer Box can used as a Tee Wye or Plenum Type Duct Box (Make your own Duct Hole Size)
CAN ONLY HANDLE UP TO 18" DUCT BOARD COLLAR.
Made from Fiberglass Duct Board material
Use only duct board start collars with Duct Board Triangles to attach the ductwork.