Galvanized steel ducts are used for ventilation, exhaust, and smoke exhaust systems in hotels, shopping malls, textile, chemical fiber, petrochemical, machinery manufacturing, instruments, electronics, tobacco, food, warehousing, office buildings, as well as for subways, civil air defense, and basements. The thickness and specifications can be adjusted according to requirements, and typically, the ends of the galvanized ducts are always connected to accessories.