Non-Return Damper

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.

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 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.

Suits most in-line fans; provides protection against backdraft with limited effect on performance.

The MCA back-draft dampers are specifically designed to suit the VentMajor and Mixvent range of fans.