【Large Size Vent Cover】The duct opening size of this door air vent is 19.69"W X 11.81"H. Front end outer dimensions are 21.65"W X 13.78"H which is removable for ease of installation. [Aluminum alloy material] The opening of the door at this door will never rust from high -quality and durable matte matte aluminum, and use long -term use of life. Its elegance, beautiful and smooth surface make it decorative at home. [Easy to install] Combined design, for simple and convenient folding and installation. This design consists of a fixed louver window and decorative framework, which can be installed and disassembled simply and simple. [45 ° slap leaf design] 45 ° shutters make fresh air enter your house while preventing water from entering. The strong and rigid design has no noise components, which can eliminate the vibration and excess noise of the shutters. These are heavy devices installed on brick and cement walls. [Extensive application] The louver can be installed on the outer wall, side walls, doors, toilets, or bathrooms. It can be used to ventilated and breathable crawling spaces to protect your house from damage and water from basic leakage., Manufacturer: A-xctoe