High quality materials: 100mm U vent grille made of high quality stainless steel, with a baked surface finish, water rust resistant, with is weather crosion resistant, suitable f useinside outside.Waterproof design: The U design ventilation grille can be used as a ceiling ventilation grille wall grille, 3 sides to prevent most rainwater from entering, 45° fixed slats prevent rainwater from entering,You can trust him.Anti Insects: The 150 mm U-shaped hood ensures better air circulation better ventilation while the central part is equipped with a mesh filter which can protect against insects rodents access, fbetter protection.Easy to use: The exteri hood grille serves as an exteri ventilation grille to cover the ventilation pipe.Barbed design, no screws screwdrivers required f installation, Ideal f all bathroom drain waste pipes tubes.Wide Application: 100mm Ventilation Grille Ideal f bathroom air vents, air conditioners, wall-mounted kitchen hoods air intakes, wall vents, heat transfer ventilation systems.