Duct connection with hemispherical dome, reducers, tees, elbows and other various angles. Our company specializes in the production of ventilation ducts: angle flange duct, a total of flange plate duct, spiral duct, inorganic glass steel ventilation pipes, polyurethane, phenolic, fiberglass, magnesite and other composite duct; impedance composite muffler products mufflers, muffler pipe, folded plate muffler, microplate muffler, muffler plenum, muffler elbow. Strong technical force, advanced production equipment, technology and testing methods, such as rank domestic counterparts advanced level. Welcome businessmen around the country to visit us!