II: calculate the required static pressure fan duct according to the situation: 1, based on the amount of wind and wind speed (wind speed 10-15 m / s or so) to determine the cross-sectional area of ??the duct. Duct aspect ratio should not exceed 2: 1 (to save material and reduce the drag). 2, according to the wind speed, the wind pipe cross-sectional area, elbows, reducers, etc. to calculate the drag (ie the required fan static pressure). Three: calculated based on air flow, static pressure. Select the appropriate fan. Exhaust fan which of several parts of it? 1. Filter: filter equipment according to customer needs, specifications and equipment unworthy belt filter. 2, motor: exhaust fan choices are Y series three-phase asynchronous motors, with high efficiency, good performance, low noise, small oscillations and other characteristics. 3, the fan: exhaust fan unit chosen package of imported brands, double inlet centrifugal fan exhaust fan, with more than a high pressure, air volume, exhaust fan designed to operate smoothly and check through the whole dynamic equilibrium, so power to reach the highest and the lowest noise and. 4, layout and panel: selection of corrosion by the use of exhaust fan, distribution leadership, exhaust fan for easy field maintenance removable aluminum layout layout; exhaust fan specifications attached silencer cotton inner board, outer board for the electrolysis board or plating zinc plate finish to the choice of spray maintenance, oxide layer and the outer coating of electrolytic plates constitute double maintenance, high strength all layout, good noise performance; small wind units may choose double-sided steel layout. Exhaust fan Model | huangnan exhaust fan | Sheng Sheng clean air conditioning by the Texas Air Conditioning Equipment Co., Ltd. purification. Texas Air Conditioning Equipment Co., Ltd. Sheng-purification (www.dzhffj.com) strong, credible, Shandong Texas fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Sheng-purification into the brilliant air conditioning and you work for a better future!