"Catering smoke emission standards" in Article 31 will be divided into catering units, large, medium, small, three types: less than three stoves for the small, 3 to 5 stoves for the medium, 6 or more stoves for the large. Different types of units on the minimum removal rate of fume purification equipment is not the same. The removal rate of grease and smoke is 60% for small units, 75% for medium units and 85% for large units. Regardless of the size of the catering unit, the concentration of fumes emitted externally shall not be greater than 2.0mg per cubic centimeter.

Extended information:

"Catering fume emission standards" Article 21 of the "Catering Fume Emission Standards" provides for the catering industry, the scope of the standard for the emission of fumes. Provides for the maximum allowable emission concentration of oily smoke from catering establishments, odor concentration, the minimum removal efficiency of oily smoke purification facilities, and the minimum discharge height of the oily smoke exhaust...?

This standard applies to the built-up areas of cities, nature reserves, scenic areas of existing catering units of oil smoke emission management, as well as new construction, expansion, alteration of catering units of design, environmental impact assessment, completion of the environmental protection acceptance and its operation during the management of oil smoke emissions; emission of fumes of food processing units and non-operational units of the internal staff canteens, with reference to the implementation of this standard.

Baidu Encyclopedia - Catering Industry Oil Smoke Emission Standards