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. How fire exhaust fan bearing location should be repaired to maintain it exhaust fan fire has now become a leader in the wind turbine industry, everyone it has no stranger to ultra-high performance, but on fire exhaust fan bearing location, How should we carry out repair and maintenance of it, professional production of exhaust fans, today as we detail below: a fire exhaust fan bearings Check the oil supply situation, if there is leakage found the box, first tighten the end cap bolts and see how kind of effect, does not work, exhaust fan price, then replace with new packing. II. If you are replacing the fire exhaust fan bearings, exhaust fan, we must ensure that the new bearings and bearing housing clean, but also to the new bearing into the oil placed 75 degrees around the set period of time after the show the shaft in the bearing during installation, remember forced to install, do not damage the shaft, but also pay attention to maintenance and other supporting equipment. III. General fire exhaust fan bearing lubricant is better replaced once a quarter, at the beginning of running axial fan, when the first oil change, to make the fan work 200 hours or so, the next oil change in one to two months, after the work is checked once a week, to see whether the transformation, normal, two to four months can replace oil, exhaust fan sales, it would be best to use a unified factory oil, replace the point to note is that you must remove the old oil and clean the fuel tank and then replaced with new oil. Sheng clean air conditioning (Figure) _ _ exhaust fan exhaust fan price offered by the Texas Air Conditioning Equipment Co., Ltd. Sheng-purification. Texas Air Conditioning Equipment Co., Ltd. Sheng-purification (www.dzhffj.com) located in Dezhou City, Shandong Province, Wuhan City acres of industrial park. Scraps and development in the wave of market economy, the current clean air conditioning Sheng Tong has a high profile in fan, ventilation equipment, and enjoys a good reputation. Sheng purification of air conditioning made the whole network business alliance certification, marking our service and management level has reached a new height. Sheng clean air-conditioning staff willing to work with all people of insight and common development, for a better future.