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Pozi head twin thread countersunk screws
Provides a neat and tidy protective joint
To provide background room ventilation
a built-in demister pad
Brown Gravity Flap Air Vent & Back Draught Shutter 4 Inch Cable Ties Pozi head twin thread countersunkProduct Description Brown Air Vent & Back Draught Shutter For 4 Inch (100mm) Extractor Fan Ducting Gravity Flap Vent Wall vent with gravity flaps and weather sill. 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 commercial and
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