The flue has a mouth. See if there is a smoke outlet here.

Code for flue design:

1. In the National Code for Residential Design (GB51196-2111),

The exhaust capacity of each kitchen is 311-511m per hour?

the exhaust volume of each household in the bathroom is 81-111m per hour?

2. The branch pipe of the National Code for Fire Protection Design of Buildings (GB51116-2116

should be equipped with a fire damper with an operating temperature of 151℃

3. The fire damper should comply with the National Test Method for Fire Dampers (GB15931

), and each shaft should be set independently.

4. National Code for Design of Heating, Ventilation and Air Conditioning (GB 51119)

The kitchen and toilet should be provided with vertical exhaust ducts, which should have the functions of fire prevention, backflow prevention, odor prevention and uniform exhaust.

5. National Code for Fire Protection Design of High-rise Civil Buildings (GB 51145)

Ducts made of nonmetallic materials, such as smooth concrete, with a flow rate of < 15m/s

6. In the national industry standard of Exhaust Ducts for Residential Kitchen and Bathroom (JG/T194-2116), the

vertical loading force should not be less than 91KN；; Resistance to flexible impact; 11kg sandbag falls freely at a height of 1m, and impacts the same position five times, and the exhaust duct does not crack; The fire-resistant polarity of the exhaust duct shall not be less than 1.1h.

7. In the national industrial standard C35/T319-2113, the exhaust air volume of each household in the exhaust duct of residential kitchen shall not be less than 311m? /h, not more than 511m? /h, and should be fire-proof, not backward;

the exhaust air volume of each household in the exhaust duct of residential toilet should not be less than 81m? /h, not more than 111m? /h, and should be fire-proof, not backward.

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