Ducting Gravity Flap 125mm / 5" Cowl Ventilation Air Vent

White Gravity Flap Air Vent Grille 190mm x 190mm / 100mm

Stainless Steel 150mm 6" Gravity Flap Vent. Perfect for intermittent fans.

Brown Gravity Flap for 100 mm / 4" Round Wall Outlet - Ventilation Duct Cover with Non-Return Shutters and Rear Spigot

AirTech Cowl Gravity Flap Wall Non-Return Valve Cowl Duct Cover Air Vent Grille 100mm (White)

Black Duct Gravity Flaps 190mm x 190mm / 100mm / 4" Vent Cover

Manrose White Square Air vent & gravity flap V41011, (H)110mm (W)110mm

Manrose White Rectangular Adjustable vent & Fly screen V1810, (H)152mm (W)229mm

Manrose White Square Applications requiring low extraction rates Hooded air vent V1241W, (H)140mm (W)140mm

Black External Gravity Flaps 150mm /6" Ventilation Duct Cover

Manrose White Rectangular Adjustable vent & Fly screen V1800, (H)76mm (W)229mm

AirTech-UK Cowl Gravity Flap Wall Non-Return Valve Cowl Duct Cover Air Vent Black-100mm

AirTech Ducting Cowled Gravity Flap 150mm / 6" Outlet Cowl Air Vent Grille with Non Return Valve / Backdraft Shutter

Manrose White Square Hooded air vent V41031W, (H)110mm (W)110mm

Manrose Brown Square Hooded air vent V41031B, (H)110mm (W)110mm

Manrose White Rectangular Adjustable vent & Fly screen V1820, (H)229mm (W)229mm

Manrose Brown Square Air vent & gravity flap V1180B, (H)125mm (W)125mm

Gravity Flaps Ducting 5" / 125mm Wall Ventilation Air Vent

Stainless Steel 100mm 4" Gravity Flap Vent. Perfect for intermittent fans

White Gravity Flap for 150 mm / 6" Round Wall Outlet - Ventilation Duct Cover with Non-Return Shutters and Rear Spigot