whether it is a small exhaust fan in the kitchen (less than 5111W) or a large outdoor exhaust cabinet (more than 5111W). 1. Kitchen exhaust fan: 1. Choose an exhaust fan with good copper core, 2. Fix the exhaust hood to prevent vibration, 3. Install the exhaust fan in a balanced way, and find out the horizontal and vertical directions. 2. Outdoor large fume hood: In addition to the above three points, the following measures can be taken: 1. Wrap all the fume hoods with sound insulation cotton; 2. Add noise reduction equipment at the air outlet; 3. Cover the fume hoods with foam composite board in 1 small houses as a whole, and stick 1 layers of sound insulation cotton inside the small houses.