Construction design scheme of HVAC project in a science and technology building
A、 The diameter or large side length of horizontally installed air duct is less than 400mm, and its spacing is not more than 4m; The spacing shall not exceed 3m if it is greater than or equal to 400mm. B、 The space between the vertically installed air duct supports is 3m, but each riser is provided with at least two fasteners. C、 For insulated air ducts, the weight per unit length of the air duct is different due to the different insulation materials selected, and the spacing of air duct supports should be multiplied by 0.85 by the length of uninsulated air ducts. D、 The installation elevation of the air duct is calculated from the bottom of the rectangular air duct and from the center of the circular air duct. Attention should be paid when installing supports. E、 The supports and hangers with the same pipe diameter shall be arranged at an equal distance, but the supports and hangers shall not be set at the air outlet, air valve, inspection door, measuring hole, etc., otherwise the use effect of the system will be affected, and they shall be staggered at a certain distance. The rectangular insulation air duct shall not be directly contacted with the support, and shall be padded with large and solid insulation material with the same thickness as the insulation layer.