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Best Choice New H&C VENT Ventilation Grille 6 x 6 Inch Vent Cover -150 x 150mm White with Slider and Insect Protection -│ Extractor Air ✔ Standard Size ✔ Great usage for all ventilation systems interior and exterior up to Ø 150 mm pipe and duct diameters.New Blauberg Condensation Control Passive Wall Intake Vent Grille Cover 100mm (4 inch) Spigot White Mould Control For use in 100mm - 4" (inch) dia walls where fresh air input is passively required.New Kair White Louvred Wall Vent Grille 155mm External Dimension with Flyscreen and Round 100mm - 4 inch Rear Spigot White plastic ducting air outlet / inlet square grille with fixed louvres and anti insect mesh / flyscreen.Best Value New HG Power Adjustable Air Vent 100mm Ventilation Grille Cover Stainless Steel Round Extractor Outlet for Bathroom Office K 【Superior Material】The air vent cover is made of SUS 304 stainless steel after brushed craft, durable to use.New Vents 4 inch Black Plastic Cowled Air Vent Wall Grill with 100 mm Rear Spigot Ducting Gravity Flap Grille Cover for Hood This black cowled hooded wall vent baffle with removable single blade back draught shutter is suitable for use with 100New Chrome Louvred Wall Vent Grille with Flyscreen for Ø 100 mm / 4" Round Wall Outlet - Air Ventilation Duct Cover with Ant Ventilation Duct Cover - The perfect solution for airflow control in your home or office. Featuring a rear spigot designNew Kair Brown Cowled Outlet Grille 155mm External Dimension Wall Vent with 100mm - 4 inch Round Rear Spigot and Wind Baffle Kair cowled vent with damper flap 155mm x 155mm external dimension with 100mm round rear spigot.New Hon&Guan 6 Inch Duct Vent Round Louver Air Vent Inside, 150mm ABS Grille Ventilation Wall Vent Cover with Built-in Fly S Louvre air vent inside make of high quality ABS.New calimaero WGQ Extractor Vent Cover 300x300mm Air Vent Covers for Walls Inside or External Fixed Louvred with Integrated calimaero WGQ Ventilation grilles serve as ventilation cover for ductings. Ready to install with dowels and screws incluNew WeCooper Cowled External Air Vent Covers 125mm,5 inch 304 Stainless Steel Grille with Backdraft Shutter,Walls Extractor 【HIGH-QUALITY MATERIALS】The wall air exhaust vent are made of high-quality 304 thick stainless steel material, are durab