How to deal with the noise of fire smoke from property to the first floor

Fire smoke exhaust noise on the first floor of the property has the following treatment methods. Noise elimination scheme: The noise elimination of fire-fighting smoke exhaust fan is to fix porous sound-absorbing materials on the inner wall of airflow channel or pipeline in a certain way to reduce aerodynamic noise and noise 10-50db.

1. Sound insulation scheme: the noise source is turned off by sound insulation method, and the noise is controlled in a small range by sound insulation cover. When sound waves radiate the shielding body, due to the impedance change of interface characteristics, part of the incident sound is reflected, part is absorbed, and part continues to pass through the shielding body. The sound insulation function of materials can be expressed by sound transmission coefficient. The lower the sound transmission coefficient, the lower the transmitted sound energy and the better the sound insulation performance of the material.

2. Sound-absorbing scheme: There are many intersecting holes in the sound-absorbing material. Sound waves hit the surface of these materials, and air entering through holes passes through these small holes. Due to anti-collision and viscous movement, the air near the hole wall and fiber surface is difficult to move, and acoustic energy is converted into heat energy and consumed. The sound absorption performance of materials is expressed by sound absorption coefficient, and the higher the sound absorption coefficient, the better the sound absorption performance of materials. The sound absorption performance of materials is related to the nature, structure, incident angle and frequency of sound waves.