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promotional exhaust louver factory direct supply bulk buy

Promotional exhaust louver factory direct supply bulk buy

Back Draught Damper
Guangdong, China (Mainland)
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Back Draught Damper




Ventilation damper the type back draught damper is a non-return damper for extract air. Made of galvanized sheet, for installation into round ducts, to shut the duct automatically when extraction of air stops. Prevent the outside air flow back.




Nominal sizes: 100, 125, 150, 200, 250, 315.

For non-return air control.

Fame made of galvanized sheet 0.8mm, inner shutter made of aluminum 0.3mm.


For installation into round ducts.

Specially designed springs allow accurate control of the shutter.


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The combination of louvered air intake vents materials makesexhaust louver very stable with a long service life.
For its material, we used louvered air intake vents that was typical for exhaust louver because it is louvered air intake vents.
exhaust louver manufactured by Yingde Ventech Air Conditioning Co.,Ltd are mainly featured by their exhaust louver materials.
Such material provides very long service life for exhaust louver.
The basic structure and operating principle of exhaust louver is exhaust louver.
The product is energy saving. Adopting energy-saving technology, it only spends the minimum amount of energy to complete its tasks.
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