[Tianjin Jinzhong Ji HVAC purification equipment to recommend the star product - by use of ventilation ducts] a distinction, air conditioning system with air tube: galvanized steel, stainless steel; (possible use of fiberglass dust pollution, complex Banned) 2, central air conditioning system with air tube: galvanized sheet, color steel insulation board; (ventilation ducts can use fiberglass, composites) 3, environmental control systems with duct: galvanized steel, stainless steel; (use plastic , fiberglass, composites) 4, industrial ventilation duct systems: steel, galvanized sheet; (Libo vent pipe can use plastic, fiberglass, composites) Note: FRP duct can be divided into organic and inorganic two basement ventilation pipeline, according to the design specification has banned organic material fire safety requirements; 5, special occasions with duct: Mine rubberized cloth duct, mining plastic vent pipe; (requiring fire-retardant anti-static mine safety features) [Tianjin Jinzhong Ji HVAC purification equipment to recommend the star product - duct] new air inlet tube and imported fresh air units without additional software required phase connection? Such as the need, sometimes import size 750X420. Can not find a standard duct connecting with how to do? A: Of course, need to add soft connection. Clear once again, the connection can not be adjustable soft pipeline project, which is the role of vibration! In addition a total of flange pipe, why must use the "standard duct"? 751.2X423.66 duct design, master workers can process the same! With a metal duct is knocked out, not with mold "cast out"! Ventilation ducts | Tianjin Jinzhong Ji (certified) | Beijing pipeline provided by the Tianjin Jinzhong Ji HVAC purification equipment. Tianjin Jinzhong Ji HVAC purification equipment Limited (www.Jzjnt.com) is a leader in Tianjin, fans, ventilation equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In the group leadership with the staff warmly welcome all inquiries negotiations to create a better future for the base.