DURABLE METAL MATERIAL: Square ventilation grille, made of high quality galvanised steel and coated with a durable epoxy finish. A nice replacement for the corrosion and old broken one. BUILT-IN MESH: The rear side built-in with tough metal mesh to protect from sand, birds, or any small objects blowed into the room. The mesh are welded on surface in one, not be separated. FRONT GRILLES: The front side with downwards grilles (check the grilles directions before installation). The arc-shaped louver edge will not hurt your fingers during installation. Front Opening Size: 6" x 6". WIDE APPLICATION: The Louver Vent Cover is widely used in HVAC system in exterior cover. It can block the vents that are not in use temporarily, also be used as an exhaust vent for exterior wall ventilation, allowing the indoor fresh air system to circulate. You can also DIY it to your RV car, external ventilation decoration of chassis and electrical boxes. EASY INSTALLATION: The elegant metal louver vents are easily installed on the any surface you need. We delivery it with screws and nuts pack, if you don't need please self-purchase glue to fasten it. Check the size chart before the purchase. Metal Vent Cover, Square Soffit Air Vent Louver, Grille Cover, Built-in Mesh Screen, HVAC Vents for Bathroom, Home Office, Kitchen