It is similar to the resistance in the circuit and is mainly used to control the medium and high frequency noise
In addition to air inlet noise reduction, the air inlet volume of the silencing channel shall also be taken into account, because the unit work and the temperature of the cooling room both require fresh air
The anechoic channel is made of steel sheet iron, the anechoic sheet is a steel skeleton, the centrifugal composite sound absorption material is wrapped with glass cloth, and the aluminum alloy perforated plate is used as the cover, with the perforation rate of 20% and the aperture φ 4. Thickness of sound absorption layer: 80mm