1. Purpose: rain louver generally installed outside the wall, preventing rain water splashing into the internal functions. Generally used as a new outlet, and sometimes as an external air intake, the larger the drag, the 2M / S wind, its total pressure loss 25Pa, use as air inlet with insect nets. 2. Material: high quality aluminum frame, the installation of water-resistant aluminum welding cutting blade made of anodized aluminum are. Our company specializes in all kinds of aluminum outlet production of central air conditioning and ventilation used: single, double Grille, rain Grille, grille outlet, since the vertical vent louvers, square, circular diffuser, exhaust port, being pressure outlet, fire air, swirl diffusers, spherical vents. The company is strong in technology, superior product quality, credit protection, low prices. Our call to discuss!