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Gravity grille
Aluminium gravity grilles — passive backdraught prevention on exterior walls and exhaust openings
Gravity grilles operate on the simple principle of their own blade weight: when the fan operates and exhaust air pressure exceeds external pressure, blades are pushed open allowing air discharge. When the fan stops, blades fall back to closed position under gravity, preventing backflow of cold or warm exterior air. Advantage over spring-loaded backdraught shutters: gravity grilles have no spring to wear or jam. Reliable operation for decades with zero maintenance. Opening pressure is determined solely by blade weight — lower than spring shutters, so installation pressure drop is minimal. Applications: bathroom, kitchen, basement and plant room exhaust — wherever an intermittent exhaust fan must prevent cold air circulation during off periods.
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B 700 x 200 mm RAL
Self-closing wall grille — 700x200 mm, painted RAL 8015 (chestnut brown).
- Factory painted RAL 8015 — the standard shade for brown joinery, timber and rustic façades
- Moving louvres: open when the fan starts, fall closed when it stops
- Long 700x200 mm format — reads as a discreet line on the façade, not a technical accessory
- Rubber-sealed louvres — silent closing
- Blocks cold air, rain and insects while the system is off
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Gravity grille 142x142mm, Ø125 mm, PVC
Exterior grille 142x142 mm, Ø125 mm with gravity louvres — opens by itself when the fan starts and closes by itself when it stops.
- Moving louvres, driven by air pressure alone — no motor, no wiring, no maintenance
- Stops cold air from coming back in through the ductwork when the fan is off
- Blocks rain, insects and leaves during idle periods
- Ø100 mm — connects directly to standard bathroom and WC fans
- Simple installation on the exterior wall, at the end of the duct
- Material: PVC, colour: white
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Gravity grille 150x150mm, Ø100 mm, PVC
Exterior grille 150x150 mm, Ø100 mm with gravity louvres — opens by itself when the fan starts and closes by itself when it stops.
- Moving louvres, driven by air pressure alone — no motor, no wiring, no maintenance
- Stops cold air from coming back in through the ductwork when the fan is off
- Blocks rain, insects and leaves during idle periods
- Ø100 mm — connects directly to standard bathroom and WC fans
- Simple installation on the exterior wall, at the end of the duct
- Material: PVC, colour: white
In stock
Gravity grille B 250 x 250
Wall grille that opens by itself when the fan starts and closes by itself when it stops. 250x250 mm.
- No motor, no wiring, no maintenance — works on air pressure alone
- Stops cold air coming back through the duct while the fan is off
- Rubber-sealed louvres — closes silently, without the metallic rattle of cheap grilles
- Anodised aluminium, not plastic — won't warp in the sun, won't discolour, won't go brittle in frost
- For bathroom, WC, kitchen and plant room extract fans
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Gravity Grille B 800 x 200 mm RAL
Gravity grille in the range — 800x200 mm, painted RAL 8015 (chestnut brown).
- Moving louvres: open when the fan starts, fall closed when it stops
- Factory painted RAL 8015 — the standard shade for brown joinery and rustic façades
- 4:1 ratio — reads as a line on the façade, not a technical accessory
- Rubber-sealed louvres — silent closing
In stock
