Ventilation ducts for air circulation and reduce the concentration of harmful gases a municipal infrastructure. Ventilation pipe, duct production and installation of the plates, profiles and other major finished materials shall comply with the relevant product design and existing national standards and apply the factory inspection certificate shall existing national standards for acceptance when the materials approach. Ventilation ducts Material: General: steel duct (ordinary steel), galvanized sheet (galvanized iron) wind pipe, stainless steel vent pipe, fiberglass ventilation pipe, plastic vent pipes, composite ventilation pipe, color steel sandwich insulation panels ventilation tube , double-sided aluminum foil insulation ventilation pipe, single color steel duct insulation, adhesive cloth ventilation tubes (such as mine ventilation duct), mine ventilation pipes and other plastics; use classification in general are: return air duct cleaning system, central air conditioning and ventilation pipes, industrial supply and exhaust ventilation duct, environment protection system for suction and discharge pipe, mine gas drainage pipe, duct and other mine rubberized cloth; shape classification in general are: round, rectangular, spiral, etc; process can be divided into corner iron flange duct, a total of flange plate duct. Reinforcement 2 HVAC professional editing power four standard air conditioning and ventilation duct figure in accordance with relevant standards, norms, represent different specification steel duct (circular wind pipe diameter less than 2000mm, 4000mm long side long rectangle within the wind pipe) reinforcing way, material selection approach. 3 Apply duct mainly used in industrial and construction projects, mainly related application areas: electronics industry clean plant purification systems, medicine, food and sterile workshop purification system, hotels, shopping malls, hospitals, factories and offices of central air conditioning systems, industrial pollution control dust, smoke, oil and other exhaust pipes, industrial environment or job comfort with air hose, gas coal mine gas drainage with drainage systems, environmental control of coal mine ventilation system ... and so on back; PS: often film, animation developed to escape and sneak dedicated route. By use of a distinction between grades, air conditioning system with air tube: galvanized steel, stainless steel; (dust pollution FRP composites disabling possible use) 2, central air conditioning system with air tube: galvanized sheet, color steel insulation board; (ventilation ducts ventilation ducts can use fiberglass, composites) 3, environmental control systems with duct: galvanized steel, stainless steel; (you can use plastic, fiberglass, composites) 4, industrial ventilation systems Duct: steel galvanized sheet; (Libo vent pipe can use plastic, glass, steel, composite materials.) Note: FRP duct can be divided into organic and inorganic two kinds, according to the design specifications have to disable the fire organic material requirements; 5, special occasions with Duct: Mine rubberized cloth duct, mining plastic vent pipe; (requiring fire-retardant anti-static mine safety features)