It is necessary to install the non-return valve of the range hood, because most communities use public flue, and the exhaust pipe of the range hood of residents in the community will be connected to the public flue. Installing a check valve will block the smoke emitted by neighbors when cooking to a certain extent, and prevent the smoke from escaping around through the public flue. However, it is difficult to completely seal it and can only play a certain role in blocking it.

Usually, the exhaust system of a range hood consists of three parts: the range hood check valve, the smoke pipe and the flue check valve, among which the check valve plays a very important role. There are two types of range hood check valves: one is flue check valve and the other is range hood check valve.

The hood comes with a hood check valve, the bottom is fixed on the top of the hood with screws, and the upper part is connected with a plastic telescopic cigarette pipe. The check valve of range hood generally has two baffles. However, due to the problem that the baffles are not tightly sealed in some range hood check valves, there may be trouble of odor backflow of range hood.

The answer is applicable to most brands of range hoods such as Shuaikang, Tai Fang and Boss.