White Hooded Cowl Extractor Air Vent & Back Draught Shutter 4 Inch Vents & Ventilation 30 x 9mm ( 3/8

30  x    9mm            ( 3/8 inch )30  x  13mm            ( 1/2 inch )24  x  19mm            ( 3/4 inch )24  x  25mm               ( 1 inch )12  x  32mm         ( 1 1/4 inch ) Measurement is the tool hole size

Rubber hook end caps for protection

Suitable for both pedestrian and vehicular use on driveways

Ideal for bays or straight windows

White Hooded Cowl Extractor Air Vent & Back Draught Shutter 4 Inch Vents & Ventilation 30 x 9mm ( 3/8Product Description White Hooded Cowl Vent & Back Draught Shutter For 4 Inch (100mm) Extractor Fan Ducting Hooded Cowl Vent Hooded Wall vent with internal back draught shutter. Helps prevent backdrafts. Manufactured with UV stable materials to reduce colour fade. Dual fitting for round 100mm (4 Inch) ducting or square ducting. Overall size: 140mm x 140mm. British made. ABS thermoplastic. Complies with Part F building regulations. Suitable for