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450mm² of airflow per 9" x 3" airbrick
5cmProtrudes 17
Black swift breeding nest brick box
Ventilation for heating and gas appliances with integral wind baffle
Other size vents and vent packs available
Brown Hooded Cowl Extractor Air Vent & Back Draught Shutter 4 Inch access_doors_panels 450mm² of airflow per 9"Product Description Brown 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
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