Easy installation: You just need to insert the ventilation grille into the ventilation pipe or hose and then nails 4 screws into the wall to complete the entire installation process Effectively prevents outdoor air from flowing back Made from stainless steel materials, resistant, and enduring 45 ° Inclined Louver, To rainwater from instilling Great for most tumble dryer vent pipes / hoses Perfect for ventilation systems, & electric dryers & cooker hoods extractors, as well as a wide variety of industrial uses, Manufacturer: Murye