How the 16 Inch Back Draught Damper Seals an Idle Duct
This is the largest one-way gate in the Ruck range, at 16 in. The flaps are spring-loaded aluminium and seat on a rubber seal; the housing is galvanized sheet steel. At this diameter a stopped fan without a damper is effectively an open window, so the part pays for itself on heating alone.
Mounting a Backdraft Shutter in the Right Place
Spring loading allows horizontal or vertical mounting, which matters on a duct this size where routing is rarely ideal. Fit it downstream of the fan with the flaps opening in the flow direction. It costs a little static pressure. Against the reverse draught through a 16 in opening, that is an easy trade. Clean the rubber seat during fan servicing so the flaps seat fully. At this bore the flaps are heavy, so a fan running at very low output may not hold them fully open.
Key Features
- Spring-Loaded Aluminium Flaps: Open on airflow and close under spring pressure, with nothing to power.
- Rubber Seal: Closes the gap at the seat so a stopped duct actually stays shut.
- Galvanized Steel Housing: Corrosion-resistant in the damp air an exhaust run carries.
- Horizontal or Vertical Mounting: Spring loading means it does not depend on gravity to close.
- 16 in Duct Fit: Matches Ruck 16 in components and standard 16 in ducting.
- Fully Mechanical: No wiring, no actuator and no control signal to lose.
Technical Specifications
| Specification | Value |
|---|---|
| Duct Size | 16 in |
| Housing | Galvanized sheet steel |
| Flaps | Spring-loaded aluminium |
| Seal | Rubber |
| Mounting | Horizontal or vertical |
| Operation | Airflow-opened, spring-closed |