Dampers
Gravity Louver
Back-draft / non-return damper
Blades open under fan pressure and fall shut by gravity when the fan stops, preventing back-draft.
Features
- Heavy GI or aluminium frame
- Lightweight, freely rotating aluminium or GI blades
- Normally closed; opened by fan pressure, closed by gravity
- Blades mounted on galvanised steel rods
- Blade layout for maximum free area and minimum resistance
- Large sizes in multiple individually operating sections
Also known as
Back-draft damper, non-return damper, pressure relief damper, over-pressure damper, auto exhaust damper, gravity shutter.
Options
- Slip-in type for insertion into ducts
- Duct mounted with flanges on both sides
- Wall mounted with a flange on one side
- Blade-edge gaskets for air sealing
Need something different?
Custom sizes, finishes and damper or plenum combinations are made to order. Tell us your requirement.
