[Tianjin Jinzhong Ji HVAC purification equipment to recommend the star product - Pipeline Project] can not make flanged duct shall meet the following requirements: 1) no flange connection interface and connection duct should meet the following seven provisions of Table 8, the core tube connecting round duct should be consistent with the requirements of Table 9; 2) sheet steel rectangular duct flange interface and accessories plant cooling project, its size should be accurate, should shape the rules, the interface should be closely ; thin steel flange hem (or flange section) should be straight, bending should not exceed 5/1000; elastic or spring clips cuttings should match the sheet steel flange; corner pieces with thin steel pipe flanges four corners of the interface should be firmly fixed, close purification plant engineering, end should be smooth, there should be connected at the continuous penetration of more than 2mm gap seam. 3) C, S-shaped cutting rectangular duct connecting tube side length should not exceed 630mm; cuttings and in charge of processing the socket should match the width of the same, which allows deviation of 2mm; the connection should be smooth, tight, cutting two side length of not less than overwhelming 20mm 4) by vertical seams, vertical rectangular duct wrapping seams connecting pipe, its stud height should be greater than or equal to the angle flange width with the specifications of the duct. The same vertical seams duct specifications, consistent edging height should stand seams, knuckle should dip, straightness deviation uniform Xu 5/1000; seams connecting rivet spacing should not exceed 150mm, indirectly, should be uniform across; Li seams, corners junction riveting, should close, no holes. [Tianjin Jinzhong Ji HVAC purification equipment to recommend the star product - decontamination] cleanroom air velocity airflow rate provisions discussed here refers to the clean indoor air velocity, air flow rate of clean space in then explained when discussing the specific equipment. For turbulent flow clean room because the main mainly by dilution to reduce the degree of indoor air pollution, so the main ventilation frequency with this concept, but not the concept of plant ventilation works directly with the speed, but the speed of the indoor air has the following requirements; (1) outlet outlet flow rate should not be too large, air-conditioned rooms and simple compared to the speed of decay require faster and larger diffusion angle. (2) the level of blowing air speed (for example, when sending side reflux rate) should not be too large, in order to avoid blowing the return airstream surface particles, causing further pollution, this is generally not a big speed 0.2m / s. _ Tianjin plant ventilation engineering Jinzhong Ji HVAC Engineering Company (certified) _ Beijing project is 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.