Soundproofing of a Heating Ventilation and Air-Conditioning (HVAC) System

Thermal comfort and air renewal are fundamental features for a building (whether residential, tertiary or industrial) requiring a Heating Ventilation and Air-Conditioning (HVAC) installation often involving air flows that are often rejected outside, and therefore, if they themselves constitute a source of flow noise e.g. because of excessive fluid speeds or if they allow the propagation of noise of upstream components, may be in able to negatively impact the sound environment, especially in the...

Noise reduction of an industrial chimney (stack)

An industrial chimney (aka stack) can constitute a source of very powerful noise potentially causing noise pollution for the environment, near or far, a fortiori if it is very high.

In the case of hot gases, the exhaust of gas turbines or combustion engines is often the source of a noise which, if not sufficiently attenuated by the components of the network, is present at the outlet of the chimney (stack) in an undesirable manner.

Hot or cold, gas flows are also often vented to the atmosphere...

Soundproofing of an industrial fan

A good sound environment is generally poorly suited to noise emissions from noisy fans, especially when a marked tone is present - when the difference in noise level between adjacent frequency bands is greater than 10 dB (from 50 Hz to 315 Hz) or even greater than 5 dB (from 400 Hz to 8 kHz) because then such acoustic phenomena are clearly perceptible to the human ear, and as such, undesirable.

In a flue gas treatment facility, industrial fans outlet is a very powerful noise source potentially...