install a flue check valve in the kitchen. Prevent the airflow from retrograde and force the flue gas to move in one direction.

Principle:

First, it is convenient for indoor fume discharge.

the second is to prevent the outdoor oil fume from flowing backwards and back to the kitchen, polluting the indoor environment, and to ensure that the check valve is firmly installed and closely connected with the wall.

the check valve of the smoke-proof flue is essentially different from the oil discharge structure of the traditional range hood. The traditional range hood adopts the direct oil discharge method, which inevitably leads to the phenomenon of oil fume back channeling. The "smoke-proof treasure flue check valve" adopts a side-row smoke exhaust method. When the range hood works, its wind force lifts the smoke hood, and its own oil smoke is discharged from the side of the smoke hood;

when the range hood stops working, the smoke hood will automatically fall down and the smoke outlet will be tightly sealed. In this way, the fume (smell) in the flue will never come back.

Extended information

Previously, due to the lack of corresponding facilities, most of the cooking fume sewage from restaurants entered the Beiyudai River in the form of direct discharge, and a layer of oil pollution floated on the river all the year round, and the untreated cooking fume affected residents' lives. In addition, due to the small kitchen area, many restaurants put back doors of restaurants with sundries and utensils, which hinders residents from traveling normally.

"In the past night, the window near the river at home was not open at all." Hong Fengying, a resident who lives at No.27 Houzaimen, said that due to the accumulation of sundries and the accumulation of oil dirt and debris on the ground, the river bank has almost no place to stay.

Since May this year, the oil fume facilities in Houzaimen Food Street have been rectified in Meiyuan Xincun Street. Restaurants on the side of the river are banned from straight pipes, and they are connected to the public flue, which "climbs" to the top floor along both sides of the residential building. "After being purified by the photolysis lampblack purifier, the lampblack discharged from the restaurant goes up along the pipeline and is discharged 2 meters above the residential building, which greatly reduces the impact on residents."

Li Xiaoning, deputy section chief of Environmental Protection Department of Meiyuan New Village Street, introduced. The sewage discharged from restaurants is also connected to the sewage pipeline and discharged after treatment. In order to prevent the accumulation of debris on the river shoreline, the street adopts the way of closing the back door of the restaurant to prevent the restaurant from encroaching on the river shoreline from the root. By the end of September this year, the rectification of the oil fume facilities in the food street was basically completed, and the sewage pipes were laid down.

The reporter saw at the scene that after the back door of the restaurant was closed, the ground along the bank of the North Yudai River was fresh and tidy.

People's Daily Online-25 restaurants in Nanjing Houzaimen "Gourmet Street" are connected to the public flue.