Vents Material: Made of high quality aluminum alloy, mirror-polished surface. Unique passivation technology, stronger corrosion resistance, not easy to rust Vent Function: available for wall mounted or ceiling mounted.the white panel can be freely detached, very convenient to clean and maintain.available for wall mounted or ceiling mounted vent Cutout Width×Length: 50mm×150mm , 50mm×200mm , 50mm×250mm , 50mm×300mm , 50mm×400mm , 50mm×500mm , 80mm×150mm , 80mm×200mm , 80mm×250mm , 80mm×300mm , 80mm×400mm , 80mm×500mm silence Ventilating Exhaust Extractor Fan for: this air vent can use as air inlet or outlet, ideal for bathroom, kitchen, office ventilation. air vent package: 1pcs×Air Vent Perforated Sheet