|
|
Non-Return Damper | | Application | Construction |
|---|
 | | Butterfly shutters are designed for use with our axial roof units. They are an optional extra on down-flow or horizontal discharge units but a standard fitting on vertical discharge units. | They can be supplied in plastic, steel or aluminium. |  | | Back draft shutters are designed for use with our centrifugal roof units and some smaller axial roof units. They fit inside the base of the unit. They are standard supply with twin fan units and an optional extra for single
fan units. | The frame is of steel and the flaps are of extruded plastic. | | | | |  | | The RSK dampers are designed to match a wide range of fans. The flaps in the unit are spring loaded ensuring a positive seal when the fan is switched off. | The tube is of galvanised steel and the flaps of aluminium. |  | | Suits most in-line fans; provides protection against backdraft with limited effect on performance. | Robust low profile engineering plastic housing. |  | | The MCA back-draft dampers are specifically designed to suit the VentMajor and Mixvent range of fans. | These are of powder coated steel. |
|
