Install a flue check valve in the kitchen. Prevent the airflow from retrograde and force the smoke to flow in one direction.

Principle:

First, it is convenient to exhaust oil fume indoors.

Second, to prevent outdoor lampblack from flowing back into the kitchen and polluting the indoor environment, it is necessary to ensure that the check valve is firmly installed and closely connected with the wall.

There are essential differences between the check valve of smoke-proof flue and the oil discharge structure of traditional range hood. The traditional range hood adopts the way of direct oil discharge, which inevitably leads to the phenomenon of oil fume channeling back. "Smoke-proof treasure flue check valve" adopts side exhaust smoke way. When the range hood works, its wind force lifts the hood, and its own oil fume is discharged from the side of the hood;

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

Extended data

Previously, due to the lack of corresponding facilities, most of the restaurant's oil fume sewage entered the Beiyudai River in a straight row, and a layer of oil pollution floated on the river all the year round. The lampblack that has not been fully treated has affected the lives of residents. In addition, due to the small kitchen area, many restaurants put sundries and utensils on the back door of the restaurant, which hinders the normal travel of residents.

"In the past night, I didn't dare to open the window by the river at home." Hong, a resident who lives at No.27 Houzaimen, said that due to the accumulation of debris on the ground and greasy dirt, the river bank has almost no place to live.

Since May this year, Meiyuan Xincun Street has rectified the lampblack facilities of Houzaimen Food Street. Riverside restaurants have banned straight pipes and unified access to public flues, which "climb" along both sides of residential buildings to the top floor. "The lampblack discharged from the restaurant is purified by the photolysis lampblack purifier, and then goes up along the pipeline and is discharged 2 meters above the residential building, which greatly reduces the impact on residents."

Li Xiaoning, Deputy Chief of Environmental Protection Section of Meiyuan Xincun Street, introduced. The sewage discharged from the restaurant 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 renovation of oil fume facilities in the food street was basically completed, and the sewage pipeline was laid.

The reporter saw at the scene that after the back door of the restaurant was closed, the ground on the bank of the Beiyudai River was clean and tidy.

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