WELL MADE This 4" air vent cover is made of weatherproof and robust brushed stainless steel. A rubber sealing ensures a perfect fit while the gummy ring minimizes the noise.PERFORMANCE The steel cowled cover offers protection against insects and other animals. It also prevents rain and wind from entering. The flap automatically closes to effectively filter dust and block cold air from getting into your living room, kitchen, or bathroom.VERSATILE USE You will be happy with this exhaust air vent cover designed for indoor and outdoor use. This is essential for your bathroom extractor fan, kitchen fan, office, garage, shed, tumble dryer ducting, and range hood extractors.EASY INSTALLATION The installation is very easy with pre-bored screw holes. You only need to insert the vent into the ventilation pipe until touching the wall and fasten it with the screws provided. Great for home improvement and industrial facilities.