There are three ways to discharge the cooking fume from the catering kitchen:

1. Exhaust it at a height of more than 3 meters above the surrounding houses.

2. Connect the smoke exhaust chimney to the sewer, and let the cooking fume discharged from catering go to the sewer.

3. Build a special kitchen, install an oil fume purification device, and separate oil stains from the chimney.

Application principle

When the flue gas from the air inlet is discharged into the flue, it will meet the flue gas from the lower floor. When the two air streams meet, it will form a vortex and an air curtain, which will hinder the upward movement of the flue gas from the lower floor. Once the fire check valve is stuck with oil and fails to open, the flue gas will cross into the room because of the upward movement.

In order to overcome the above technical problems of smoke cross-smell, The solution is to use the principle of aerodynamic dynamic-static pressure conversion (Bernoulli theorem), and the combined variable-pressure fire-resistant flue developed by Jiangsu Ziwei Institute of Building Technology, and set the patented variable-pressure non-return components for gas extraction and accelerating airflow in the flue to make the flue gas complete the dynamic-static pressure conversion at a specific position.

Make the exhaust port of the kitchen or toilet where the smoke exhauster can't be turned on in a negative pressure state, and use the principle of Bernoulli's theorem to form a suction force, so as to eliminate the eddy current and air blocking curtain, and solve the problem of odor and odor in the exhaust duct.

this product can effectively solve the problems of gas vortex, gas curtain blockage, flue gas backflow and smoke cross-smell, meet the needs of residential construction, and has the functions of preventing smoke cross-flow, backflow, fire resistance and fire prevention, reaching the leading level of similar products in China. This achievement was listed as the national promotion project of scientific and technological achievements in construction industry in 2112.