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Black swift breeding nest brick box
450mm² of airflow per 9" x 3" airbrick
Allows a 3-5 course stagger
Interior and exterior use
Moulded in mortar key ensures secure adhesion to the building fabric
Brown Hooded Cowl Extractor Air Vent & Back Draught Shutter 4 Inch access_doors_panels Black swift breeding nest brickProduct 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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