The axial flow fan will produce some noise when it is running, but there are noise reduction measures according to the installation requirements of ventilation pipes. In general, the ventilation muffler or muffler elbow is installed at the front end and back end of the axial flow fan. But to tell the truth, the muffler equipped by ventilation manufacturers has little effect. However, this does not necessarily lead to excessive noise affecting nearby sensitive points. Because ventilation pipes are usually suspended by vibration-damping hangers, there are air inlet and exhaust flexible joints between the two ends of the fan and the pipe to reduce vibration transmission. This will basically not cause obvious solid sound transmission problems. In addition, as long as the pipeline design is reasonable (the thickness of the pipe wall is rigid enough), the noise will not be too obvious when the internal flow rate is appropriate. However, the sound insulation performance of the civil passage and shaft itself is not bad, and there will be no so-called * * * vibration and noise problems.
I am a professional noise reducer, which is rare among the problems I have encountered. However, most similar situations with obvious noise are not caused by ordinary ventilation, such as 1. In some office buildings, canteens and kitchens are located underground or near the rooms where office buildings are located. When the air volume required for kitchen smoke exhaust is large, it is easy to cause serious pipeline noise and affect the adjacent sensitive rooms. 2. The indoor air conditioning unit and fresh air unit are arranged irrationally, and their own noise is more prominent, thus affecting their adjacent rooms.
Usually, in the process of architectural design, some national codes clearly stipulate that the layout of equipment or computer rooms that highlight noise should be far away from sensitive areas and sensitive rooms. These sensitive areas generally refer to rooms that need to be quiet, such as living room, study room, office, reading room, conference room, medical room, education and research room, etc. In addition, under the inevitable circumstances, effective noise reduction measures need to be taken to control the noise within the scope stipulated by the state.