Ventilation duct is generally divided into three materials: white iron (Galvanized) ventilation pipe, glass fiber reinforced plastic ventilation pipe, composite material ventilation pipe;
通风管道广泛应用建筑工程，如：饭店，宾馆，酒店，医院，工厂，商场大楼，办公大楼等。
Ventilation ducts are widely used in construction engineering, such as: hotels, hotels, hospitals, factories, shopping malls, office buildings, etc.
