Back Draught Damper

Made by galvanized steel,
The valve opens when overpressure occurs and closes by means of spring when the pressure drops.
Size:100mm, 125mm, 150mm, 200mm, 250mm, 300mm, 360mm and etc.

Back Draught Damper, PVA

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  Back Draught Damper pressure relief valve PVA is used for preventing the reverse of air flow in circular duct systems.

• Backdraught dampers casing of PVA is made from galvanized steel, the blades are made of aluminium.

• With a inner foam seal for better tightness and noise reducing.

• The valve opens when overpressure occurs and closes by means of spring when the pressure drops.

• It is recommended to install the shutter into horizontal duct.