The spiral duct market is divided into three types: galvanized spiral duct, stainless steel spiral duct and composite spiral duct. Among them, stainless steel duct quality is the best, the applicability is strong, but the price is high. The most widely circulated spiral duct in the market is galvanized sheet. Galvanized sheet spiral duct, basically stainless steel spiral duct characteristics, but the price is only two thirds of the stainless steel duct and even lower. The composite spiral duct is generally used in the outside environment, which is not too high for the air duct.
