### How to Calculate the Kitchen Fume Emission Height?

When the surrounding buildings are higher than the height of the oil fume discharge, are located in the downwind of the local wind direction, and have high cleanliness requirements, it is necessary to consider increasing the height of the exhaust outlet of the smoke exhaust pipe. The exhausted flue gas has a certain speed and temperature, that is, the flue gas has upward power and buoyancy, and then spreads along the wind direction. The smoke spreads out horizontally and is called a plume. The rising height of the flue gas is called the plume lifting height, expressed by △h. When the height of the duct exhaust outlet plus the smoke plume lifting height exceeds the building height that should be avoided, it is the height that the flue exhaust outlet should have. The specific calculation method of the plume lifting height is

v,-Exhaust air speed of flue exhaust outlet (m/s) ;

v-local general wind speed(m/s) ;

D.-Flue outlet diameter (m) ;

T,-flue gas thermodynamic temperature (K) ;

T- -Thermodynamic temperature of the surrounding atmosphere (K)。

Since the oily fume produced is intermittent and filtered by the oily fume purifier, the
concentration of oily fume is limited. When it exceeds a certain distance,its impact can be ignored.