Min. Order Reference FOB Price
200 Pieces US$0.50-2.84 / Piece
Product Description
Back Draught Damper, PVA/PVB - The pressure relief valve PVA/PVB is used for preventing the reverse of air-flow in circular duct systems. - The casing of PVA/PVB is made from galvanized steel, the blades are made of aluminium. - PVA with a inner foam seal for better tightness and noise reduction. ...