How to calculate the exhaust air volume of hotel kitchen

The number of air changes in the kitchen is generally about 60 times/hour, that is, the space volume of the kitchen multiplied by 60 is the total air exhaust per hour (the kitchen height 100 square meter is calculated as 3.5 meters, and the air exhaust per hour is 100× 3.5× 60 = 2 1000 cubic meter). It is also required that the wind speed of the air duct at the interface of the range hood is 7 ~ 8m/m. 2 1000 m3/h ÷3600 sec/h ÷ 7m/s = 0.83m2, and the appropriate length and width can be selected according to the cross-sectional area of 0.83. The thickness of air duct is mainly related to heat insulation, and the influence point is mainly the influence of surface roughness of air duct on resistance along the way. Generally speaking, the air supply in the kitchen is lower than the smoke exhaust by more than 10%, so as to maintain the negative pressure environment in the kitchen and prevent the smell from being emitted to the hall.