Kitchen various fried, fried, steamed, boiled, fried, grilled and other equipment in the process of processed foods continue to produce a variety of high temperature, humidity, pollution gas. Accumulated to a certain extent, the kitchen will be unfit to continue working. So fans will need to use polluting gases discharged through the exhaust pipe kitchen. Comparison to the front wheel and rear wheel advantages :() opt for a lower speed (low noise), smaller diameter can get a larger air volume total pressure. Forward impeller disadvantages: low efficiency, high energy consumption, easy cleaning cleaning. After the impeller advantages: high efficiency, energy saving, easy cleaning cleaning. After disadvantage compared to the impeller to the impeller) to be given equal air flow and total pressure required for high speed (and therefore noise), and a larger diameter front :(. 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. Custom customized exhaust fan exhaust fan, Sheng clean air-conditioning (certified), Hulunbeier exhaust fan is provided by the Texas Air Conditioning Equipment Co., Ltd. Sheng-purification. Texas Air Conditioning Equipment Co., Ltd. Sheng-purification (www.dzhffj.com) is an industry leader in Shandong Dezhou, 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 . Sheng leader in clean air conditioning with the staff warmly welcome all inquiries negotiations to create clean air conditioning Sheng better future.