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Silencers for HVAC systems

When designing a ventilation system, even with the best components and materials, noise is inevitably raised, always present and transmitted from the source of noise in all directions, reflecting from various surfaces. It is already the case that in a ventilation system, the supply and extraction of air requires the air to be pumped by fans, which are always more or less noisy. When installing ventilation systems, noise can be absorbed or reflected from different surfaces. Noise is the airborne waves that change their sound level with distance. A correct and good installation of the ventilation system requires a general understanding of noise, what to do to reduce noise in the system? When installing a ventilation system, the best location of the silencer element is where the highest wave turbulence may be. Where most noise waves will hit the silencer. Also, where it is possible to install porous materials in angular elements, damping is most pronounced there. However, if there is significant noise turbulence, then direct damping can be effective as it additionally provides noise reflection from the walls, which often additionally suppresses noise propagation in the duct. The more noise waves hit the soft porous surface, the more they will be suppressed, which usually results in silencers mounted just behind the fan.