One is the problem of the kitchen flue non-return valve:The kitchen flue non-return valve is not installed, resulting in the public **** flue smoke from the exhaust pipe back to the room. Although the hood will come with a non-return valve, if it is not installed at the flue. Other people's homes when cooking in the kitchen. Once *** the next door neighbor using the flue is cooking in the kitchen, the resulting fumes are discharged through the range hood into the flue, and this fumes flow back to our kitchen through the exhaust pipe of our own home, the residential exhaust ducts are chimneys installed in the residential kitchen, bathroom to centralize the emission of fumes sent to the outside space to go, it is used to exclude the kitchen fumes or the bathroom turbid gas of the non-metallic piping products, also known as the residential exhaust ducts, Residential ventilation duct, residential smoke duct.

The first and most important reason is that our indoor smoke exhaust place is not closed tight. For example, if we install our hood's exhaust pipe on the civil flue, and the surrounding area is not sealed, then these gaps may appear to return to the fumes. This reason is also and smoke window holes are not installed at the appropriate smoker's original generation, if the installation of the reverse smoker will not fall back to produce back smoke, but the installation of the reverse smoker, is a little bit of an effect on the range hood, because it takes a lot of gas to crash the valve of the reverse table smoker. If you live in a house is a city high-rise housing or neighborhood housing, there is a public **** flue can check whether the home of the public **** flue mouth is installed with a flue check valve. No installation or flue check valve broken to be replaced in time. Master open hole flue opened to the main flue, should be opened in the secondary flue, and to install a better back to the smoke treasure.

Pouring smoke a few reasons to see if the outlet is blocked, or pipe deformation, or is not a long time too much grease, there is also their own cleanup after the fan installed in reverse, these reasons! 1. a long time did not use the cooker, there may be a situation, slowly burn, a small amount of burning can be resolved. 2. weather reasons, the direction of the wind, because the house and the surrounding houses lead to the problem of the wind direction may be to the smoke. 3. The design of the flue itself has unreasonable problems. 1. long time did not use the stove, may appear this situation, slowly burn, a small amount of burning can be solved. 2. weather reasons, wind direction, because the house and the surrounding houses lead to wind direction problems, may be to the smoke. 3. the flue itself has unreasonable problems in the design.