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                                                            HomeAir Control DampersVolume Control Dampers Backdraught shutter
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                                                            Access Door for spiral duct £4.76 – £16.76 Ex VAT
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                                                            Single blade balancing damper £7.19 – £13.78 Ex VAT

                                                            Backdraught shutter

                                                            £4.71 – £15.33 Ex VAT

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                                                            SKU: BDS Categories: Air Control Dampers, Volume Control Dampers
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                                                            • Description
                                                            • Additional information
                                                            Description

                                                            Backdraught shutter

                                                            These simple “butterfly” type backdraught dampers have lightweight hinged blades which will only open in one direction, preventing airflow in the opposite direction. A small spring helps to keep them in the closed position without causing significant back pressure when the fan is running.

                                                            Backdraught dampers are normally used on ducted extract systems to prevent cold outside air from being blown back into the building when the fan is turned off. They can also be used with wall fans if the wall fan does not have it’s own BDS.

                                                            The galvanised steel casing is designed to slip inside spirally wound steel ducting or flexible ducting.

                                                            2nd Duct dia (mm)No
                                                            Cowl Size250

                                                            Low cost solution for preventing backflow through a duct
                                                            Galvanised casing and blades
                                                            Spring assisted closing
                                                            Metal hinge pin

                                                            Additional information
                                                            Weight5 kg
                                                            Duct Size(mm)

                                                            100, 125, 150, 200, 250

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                                                            Single blade balancing damper

                                                            £7.19 – £13.78 Ex VAT
                                                            Single blade balancing damper Product Code: SBDC - Galvanised steel casing and blade - Lockable plastic manual control
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