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100mm External Wall Vent Cover: White hooded cowl ventilation grille designed for 100 mm (4 inch) round ducting and extractor fan connections; features a 155 x 155 mm faceplate, modern cowled wall vent design and tidy exterior finish Backdraught Shutter with Gravity Flap: Built-in removable single blade anti-draught shutter closes automatically when the extractor fan is off; helps reduce cold air, wind, unwanted draughts, rain ingress and external noise while limiting entry of birds and rodents Durable White Plastic Cowled Grille: Made from strong, heat-resistant and UV-resistant plastic for indoor and outdoor ventilation applications; the hooded vent cover and removable shutter are designed for easy cleaning and long-term exterior wall use Easy Installation and Airflow Design: Designed for straightforward mounting on external walls using compatible 100 mm ducting and fittings; the duct cowling baffle helps reduce wind noise and draughts while allowing extracted air to flow outside through the ventilation outlet Bathroom, Kitchen and Tumble Dryer Ventilation: Suitable for compatible 4 inch extractor fans, tumble dryer ducting, wet room ventilation, utility rooms and kitchen air extraction systems; practical external cowled grille for residential and light commercial ventilation