Maybe the design of the exhaust pipe is unreasonable. A bend in the exhaust pipe of the range hood is enough. If the smoke exhaust pipe bends too much, the smoke exhaust will not be smooth, the speed will be much slower, and the smoke exhaust effect will naturally be poor. The standard length of the smoke pipe of a general range hood is1.5m. If it is higher than this length, it will also affect the smoking effect. Narrow flue or narrow space will block the flue, which will lead to the failure of the range hood to discharge the oil fume in time, and the oil fume will spread in the flue for a long time, which will lead to the flue approaching a blocked state. Once the flue is blocked and the oil fume cannot be discharged, contact the property in time to solve the problem of pipeline dredging oil fume. The air cannot circulate. The work of range hood needs to keep indoor air circulation. If the kitchen doors and windows are closed, the impeller of the range hood will encounter certain air resistance during operation, which will lead to the inability of air circulation and the effect of oil smoke absorption will become worse. Therefore, when the range hood works normally, you can open the kitchen window by 5- 10cm. This space will not make the air convection too large, causing the soot to be blown away, nor will it be too small, causing the air not to flow. There are too many oil stains in the range hood. After the range hood is used for a period of time, it must be cleaned up and paid attention to daily maintenance to prevent excessive oil stains from accumulating in the air duct system of the range hood, resulting in a decrease in suction. After all, the life of the range hood is also related to the frequency and quality of use. Usually, cooking at home is less, resulting in less lampblack, and the working effect of the range hood is naturally good. Compared with the range hood, it is of good quality and easy to clean, so the oil content is high, and the oil accumulation inside the range hood will also be reduced.