Knowing the causes of oil fume backflow and poor smoke exhaust, the solution is easy to handle. As long as a tightly closed and tightly opened check valve is installed at the outlet of the range hood, the problems of oil fume backflow and poor smoke exhaust can be eliminated. Common sense tells us that the door is closed, and the biggest wind can't get in. The reason to solve the oil fume backflow is as simple as that.
However, it is difficult to "tightly close" the check valve on the cover or the check valve installed later. Due to structural reasons, these valves will be sucked open when the system is under negative pressure. Especially, the installed range hood has an increasing air volume, the probability of negative pressure is increasing, and the frequency of oil fume backflow is increasing.
The high-volume range hood is really comfortable for its own use, but it brings the hidden danger of lampblack reflux to neighbors. Similarly, the installation of large-volume range hoods by neighbors will also bring you the hidden danger of oil fume reflux.
At present, there is an "electric smoke sealing valve", which is kept closed by a strong spring when the range hood is closed and will not automatically open due to positive and negative pressure in the flue; When the range hood is turned on, the motor is used to overcome the spring force and the adhesion of oil dirt, which is not afraid of the adhesion of oil dirt and has no air leakage ring, thus truly achieving "opening in place and closing tightly". Pay attention to your choice when buying a range hood.