A horizontal duct damper, or a horizontal backdraft damper, is used to prevent air from flowing in the wrong direction through the duct when the fan is not in operation. Air can only flow in one direction, as the dampers close when air flows in the wrong direction. This way, you prevent dirty, exhausted air from ever flowing back into the ventilated space.
Installing a horizontal backdraft damper is very important in situations where heavily polluted air is being exhausted, such as in industrial applications. In such cases, you want to avoid at all costs that this air flows back and is inhaled. There is also a fire-safe version of this damper, which can contribute to smoke and heat extraction (RWA) in the event of a fire, in conjunction with a smoke extraction fan.
Since the dampers are made of powder-coated metal, they can also be used outdoors.
The variants of the horizontal backdraft dampers are from the brand Ruck and are therefore also used in conjunction with the axial fans and other components from Ruck.
These horizontal dampers are available in the following sizes (mm):
These fire-safe dampers can withstand a temperature of 400 degrees for a period of 2 hours, thus meeting the F400 safety standard. This means that these components are also suitable for the proper extraction of smoke and heat in the event of a fire. We offer the following dimensions (mm):
Since the backdraft damper is equipped with flanges on both sides, it is very easy to connect it with bolts to the axial fan or other components of the ventilation system. The horizontal damper should be placed in a horizontal duct, and as close as possible behind the axial fan. This way, air never flows back from the ventilation system.
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