Galvanized Spiral Duct is a type of ventilation pipe used in hotels,MallTextiles, chemical fibers, petrochemicals, machinery manufacturing, instruments, electronics, tobacco, foodWarehouse, office buildings, as well as ventilation, exhaust, and smoke exhaust pipe systems for subway stations, civil air defense facilities, and basements.ThicknessAnd specifications can be varied according to requirements, usually inConnectAt that time, both ends of the galvanized spiral duct are always connected to fittings.