Exhaust fan options: one, selected according to the arrangement of kitchen space and fume hood fan unit required is calculated as follows: 1, the overall exhaust volume, according to the kitchen space, air changes per hour 40-60 times. Such as kitchen total area of ??160 square meters, a height of 3 meters. We need ventilation to 160X3X60 = 28800m3 / h. 2, local kitchen exhaust hood according to the windward side (minus the perimeter wall of the fume hood length), the wind speed of about 0.5 meters per second. Such as kitchen exhaust hood perimeter of 25 meters, where the wall length of 10 meters. The amount of ventilation required to 3600X (25-10) X0.5 = 27000m3 / h II: Calculation of 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 duct cross-sectional area. 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. Fan If abnormal sound during operation, the motor severe fever, switch trip, start anyway and so should immediately stop inspection; it should be a five-minute test run exhaust fan specifications after repair, until it is determined no longer function abnormalities. Shall from time to time to supplement or replace the bearing lubricant. When no fan should be placed in a dry environment, avoid moisture. Install exhaust fan, exhaust fan, liter by liter Rui Rui Electrical and Mechanical Ventilation and Air Conditioning Electrical Equipment Factory. L Rui HVAC Electrical Equipment Factory (www.dzsrxfkt.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 the Swiss mechanical and electrical liter into the brilliant and you work for a better future!