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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.

     

 

 

 

Model D L1 L
100 96 6 88
125 121 19 88
150 146 31 88
160 155 36 88
200 197 56 88
250 247 61 128
315 312 94 128
355 352 65 198
400 397 64 198
450 447 80 248
500 497 107 248

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