Exhaust fan is used in the construction of a more exhaust fan, whether civil or enterprise workshops require the use of low-noise, low-noise exhaust fan that is having a sound-absorbing effect, but also has insulation special effects, sound insulation for the exhaust fan How should we deal with it? Sound insulation exhaust fan is mainly used method is to enclose the noise source, noise control using acoustic enclosures in a small area. When sound waves encounter shield, since the interface characteristic impedance changes part of the incident sound energy is reflected, part absorbed, part of the sound energy penetration into the shield continues to spread. Sound insulation properties of materials can be used to represent the sound transmission coefficient. Sound transmission coefficient becomes smaller, the acoustic energy penetrating the less, the better the insulation properties of the material. Sound insulation performance and insulation body structural materials, the nature and the incident sound wave frequency. This is the knowledge of the exhaust fan, hoping to help to you. 

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