100/150Mm Stainless Steel Movable Square Vents External Wall Rain Cap

100/150mm stainless steel square wall duct grill vent ventilation exhaust Ideal for modern home Made of stainless steel material, , rust-proof and corrosion-resistant Open when the wind blows, close when the wind stops, rainproof and windproof, suitable for outdoor exterior walls The louvers are designed for use where external air transmission and weather protection are required, these external louvers can also be used in natural ventilation applications.