300*300, 350*350, 400*400.

Construction of a single flue type flue consists of a simple rectangular flue pipe that runs vertically through each level of the home, leaving an air inlet connected to the exhaust hood in each level of the home, and the bottom floor is made up by a make-up air inlet, which is based on the principle that the flue smoke on each level is discharged into the flue pipe under the impetus of the exhaust hood, and due to the flue gas The principle is that the smoke from each layer is discharged into the flue under the push of the exhaust hood, and due to the effect of the temperature of the smoke, the upward buoyancy is generated in the flue, and the smoke is discharged from the air outlet out of the roof.

Kitchen flue installation precautions

Sub-flue must be retained: every kitchen has a flue, while the flue also has a main and secondary points, the main flue through the entire building, while the sub-flue is relatively independent. Generally the home's fumes will first go to the secondary flue, and then through the holes in the partition into the main flue, which ensures that the fumes of each household is isolated. If the secondary flue is connected directly to the main flue, it will cause backed-up smoke or smoke stringing phenomenon due to low pressure.

It is important to note the location where the range hood is installed. The shorter the pipe, the better. Some homeowners will pull the pipe longer for the sake of aesthetics, so that after turning off the hood, the pipe will still collect a lot of grease and smoke can not be discharged, and then back into the room. In addition, in order not to destroy the original primary and secondary flue, the direction of the opening is not arbitrary can be changed, so users need to pay attention to be sure to play in the secondary flue inside.

The above content reference? Baidu Encyclopedia - flue