Non-return damper
Non-return damper
In intermittent-operation ventilation systems, if the fan is stopped, the backdraft damper will prevent outside air from entering the building and the resulting energy losses.
Non-return damper
The non-return damper consists of a steel body and two spring-loaded flaps that close when the fan stops running. In this way, the ductwork is isolated from the ingress of outside air and from thermal disturbances.
The + products
- energy savings and comfort when the fan is switched off,
- easy to install.
The flaps of the backdraft damper are spring-loaded to close as soon as the fan has stopped running.
- steel body,
- aluminium flaps,
- in-mould seal between the damper and the duct (double seal above diameter 250) and between the closed flap and the damper body.
- slots simply into a circular duct,
- when mounted vertically, the flaps must open upwards.
- ensure the direction of assembly is correct so that the flaps are in the open position when the fan unit operates.
| Insulation material |
|---|
| References | L1 (mm) | L2 (mm) |
|---|---|---|
| 11094680 - Backdraft damper Ø 80 | 40 |
42 |
| 11094681 - Backdraft damper Ø 100 | 40 |
51 |
| 11094682 - Backdraft damper Ø 125 | 51 |
65 |
| 11094683 - Backdraft damper Ø 150 | ||
| 11094684 - Backdraft damper Ø 160 | 68 |
82 |
| 11094685 - Backdraft damper Ø 200 | 74 |
95 |
| 11094686 - Backdraft damper Ø 250 | 120 |
145 |
| 11094687 - Backdraft damper Ø 315 | 160 |
178 |
| 11094688 - Backdraft damper Ø 355 | 160 |
198 |
| 11094689 - Backdraft damper Ø 400 | 160 |
223 |
