With the development of economy and the improvement of people's living standard, it is very convenient to eat out now. People with different tastes can find a restaurant that suits their tastes. Now there are many catering companies, each restaurant must have a kitchen that can cook and a kitchen to cook, but due to the influence of exhaust ventilation pipe and its length and raw materials.

　　在操作过程中可能会产生很多噪音，这会影响周围的环境，并会受到周围环境的影响。居民投诉。那么，这种噪声攻击的原因是什么呢，遮光罩单元不牢固。如果方向不平整，螺钉松动并且零件掉落，则会在支架上形成共鸣声。

　　During operation, there may be a lot of noise, which will affect the surrounding environment and will be affected by the surrounding environment. Complaints from residents. So, what is the cause of this noise attack? The hood unit is not firm. If the direction is not smooth, the screw is loose and the part falls, it will form a resonance sound on the bracket.

　　此时，有必要重新安装抽油烟机或部件。必须估计位置以确保设备的正确性，止回阀装置不正确。例如，如果止回阀失效或掉落，则排烟效果不好。烟灰在管道中，止回阀发生共振或气流受到干扰，容易产生噪音。

　　At this time, it is necessary to reinstall the range hood or components. The position must be estimated to ensure the correctness of the equipment, and the check valve device is not correct. For example, if the check valve fails or falls, the smoke exhaust effect is not good. When the soot is in the pipeline, the check valve resonates or the air flow is disturbed, which is easy to generate noise.

　　这时，应重新安装止回阀或用新的止动阀代替阀，转子叶片变形，并且设备不正确。由于长期使用，风轮上附着了大量的机油，导致不平衡，并且叶片的部分破损可能会引起噪音。此时，应定期清洁抽油烟机，必要时应更换风轮。

　　At this time, the check valve should be reinstalled or replaced by a new check valve, the rotor blade is deformed, and the equipment is not correct. Due to long-term use, a large amount of oil is attached to the wind turbine, resulting in imbalance, and part of the blade damage may cause noise. At this time, the range hood shall be cleaned regularly and the fan wheel shall be replaced if necessary.