It is very effective in preventings air current and increasing ventilation. The rings of thickened stainless steel chimneys is specially designed, and ones by ones is placed ones by ones. The wind will not flow down the chimneys. Rotate the cover of the chimney cover cover for ventilation pipes, chimneys and air extraction. Suitable for factories, farms, production workshops, kitchens, roofs, home, farms Versatile Application: Perfect for a wide range including chimneys, farms, factory roofs, commercial spaces, ventilation ducts, residential buildings, warehouses, and more. Enhance air circulation and maintain optimal indoor conditions effortlessly. The ventilation mouth hat is designed to rotate with the wind, the more wind blows, the more the leaves rotate, the strongers the wind from the inside out, and the old air in the room Suitable for chimneys and ventilation systems., Manufacturer: FGJtguE