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Lever Action Flush Door Bolt
On roofs with rafter spacings of between 400mm and 600mm25mm2 continuous airflow
Maximum opening the vent will cover: 9" x 6"
Sandtoft Standard attern
Size: 40mm x 40mm
Terracotta Louvre Extractor Air Vent & Back Draught Shutter 4 Inch Weep Vents Lever Action Flush Door BoltProduct Description Terracotta Air Vent & Back Draught Shutter For 4 Inch (100mm) Extractor Fan Ducting Louvre Vent Louvre wall vent with weather sill. Helps prevent backdrafts. Manufactured with UV stable materials to reduce colour fade. Suitable for round 100mm (4 Inch) ducting. Overall size: 140mm x 140mm. British made. ABS thermoplastic. Complies with Part F building regulations. Suitable for commercial and domestic use. Other vents and colours
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