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8800mm² airflow
With a 6 metre run of over fascia ventilator
Pack of 100
Eight holes eliminates clogging and aids dust extraction
Terracotta Extractor Fan Air Vent Gravity Flap for 4 Inch Ducting Roofing 8800mm² airflowProduct Description Terracotta Air Vent Ducting Grille For 4 Inch (100mm) Extractor Fan Ducting 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 domestic use. Other vents