Duct  manufacturing and installation of the plate, profiles and other major  finished materials, should be consistent with the design and related  products, the existing national standards, and application of factory  inspection certificate, the material approach should be the current  national standards for acceptance. Ventilation pipe by material points:
There  are: steel pipe duct (ordinary steel), galvanized sheet (white iron)  duct, stainless steel ventilation pipe, FRP ventilation pipe, plastic  ventilation pipe, composite ventilation pipe, color steel sandwich  insulation board ventilation pipe, Such as mine hairdryer), mining plastic ventilation pipe;
Ventilation pipe by use points:
Generally have: purification system back to the duct, the central air  conditioning ventilation pipe, industrial ventilation and exhaust  ventilation, environmental protection system suction exhaust pipe, mine  drainage gas pipe, mine coated air duct, etc .;
Ventilation pipe by shape points:
Generally have: round, rectangular, spiral and so on;
Ventilation pipe according to the processing technology points:
Can be divided into angle iron flange, a total plate flange duct.
application
Duct  is mainly used in industrial and construction projects, the application  areas are mainly involved: the electronics industry clean room  purification system, pharmaceutical and food aseptic workshop  purification system, hotels, shopping malls hospitals, factories and  office of the central air-conditioning system, industrial pollution  control Dust, smoke, oil and other exhaust pipe, industrial environment or  post comfortable with the air duct, coal mine gas drainage gas drainage  system, coal mine environmental control with the return air system ...  and so on;
Material grade
Material grade is generally divided by purpose
1, clean air conditioning system with air duct: galvanized sheet,  stainless steel; (may occur in the use of dust pollution of glass fiber  reinforced plastic, composite materials disabled)
2, the central air-conditioning system with duct: galvanized sheet,  color steel insulation board; (can use FRP, composite materials)
3, environmental control system with duct: galvanized sheet, stainless  steel; (can use plastic, glass steel, composite materials)
4, industrial ventilation system with duct: steel plate, galvanized  sheet; (Libre ventilation pipe. Can use plastic, glass steel, composite  materials)
Note: FRP duct can be divided into organic, inorganic two, according  to the design specifications have fire requirements of the ban on  organic materials;
5, special occasions with the use of ducts: mine coated air duct,  mining plastic ventilation pipe; (require flame retardant anti-static  mine safety features)
Duct construction
1)  For the more complex civil buildings, in the design stage, the various  types of work (HVAC, water supply and drainage, power supply lighting  and construction) should first negotiate a good space separation, set  the elevation of each pipeline range. Under normal circumstances shall not be out of their own limits. In case of individual pipe to cross the border should be with
Other engineering consultation.
2)  to solve a variety of ventilation pipes and touch the principle of  coordination, generally: "small tube to large tube, there is pressure to  pressure." For example, if the water pipe collides with the duct, you should turn the water pipe. Cold, hot water pipes and water pipes collide, you should change the cold, hot water pipes.
3) before the construction of the equipment should be the Explorer, the various types of pipeline, single line drawn on a plan. Each channel uses a color pen. At the intersection of the intersection of its elevation to see if  there are contradictions, and found that the problem will be resolved  before the installation.
4) In order to reduce investment, save space, reduce the high level,  and some laying no slope requirements of the pipeline, you can wear beam  laying (such as water pipes, fire sprinklers, etc.).
Inorganic fiberglass ventilation ducts
Inorganic  fiberglass ventilation pipe (also known as glass fiber magnesium  chloride cement ventilation pipe) is based on magnesium chloride cement  cementitious material in the alkali glass fiber as a reinforcing  material, adding filler and modifier made of a pipe. It has a non-combustion, non-combustible material A-level, corrosion resistance, high strength and light weight and so on. In  the construction, underground engineering and industrial plant  ventilation, it has completely replaced the non-flame-resistant organ  glass fiber reinforced plastic ventilation pipe, and gradually replace  the poor corrosion resistance galvanized iron ventilation duct. Especially  in the humidity of the underground works and the south of the Yangtze  River region, its superiority is more significant. In recent years, its application is popular throughout the country. However,  through the research of magnesium chloride cementitious materials and  the detection of products, it is found that inorganic glass fiber  reinforced plastic ventilation ducts still have some quality problems in  production and engineering applications. Some quality problems seriously affected the life of the project, should cause everyone to pay enough attention.
Plane flange flanges
A  total of plate flange duct, also known as no flange duct, its  production form than the traditional rectangular duct processing speed  faster, more convenient, smaller air leakage rate. The  advantage is to save materials, reduce investment in engineering; air  leakage is small, reduce energy consumption, save operating costs,  popular construction enterprises welcome. The  United States and Europe and other developed countries from the  nineties began to use ductless flange connection, the current process  has been widely used in various projects.