[Tianjin Jinzhong Ji HVAC purification equipment to recommend the star product -] According to "Ventilation and Air Conditioning Engineering Construction Quality Acceptance" GB50243-2002 requirements, ventilation and air conditioning system installation quality control. 1. pipe hanger from the flange distance of not less than 20 mm, flexible short tube length 150-250mm. Metallic and non-metallic hose hose length must not be greater than 2 m, should not bend or collapse concave dead. 2. The main duct from the air hanger, insert takeover distance should not be less than 200mm. 3. duct flange bolt hole spacing (in the low-pressure air is not more than 150 mm pipeline project, the high-pressure air distance of not more than 100 mm). The fire damper and exhaust valves and fire wall distance of not more than 200 mm. [Tianjin Jinzhong Ji HVAC purification equipment to recommend the star product - duct] spiral duct pipes are thin-walled tube made of metal tape reel spiral seam bite, round, no welding angle iron flanges pipes, exhaust pipes do not leak, watertight, and more for the supply and delivery of bulk materials, instead of the traditional tin tube (ie, hand-sewn bite iron pipe). Duct is a whole mechanism, straight pipe without manual beat. Angle iron flanged pipe | Tianjin Jinzhong Ji pipeline project (certified) | Tianjin Tianjin Jinzhong Ji HVAC duct by 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.