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Mechanical Equipment

Dwellings

If any, air intake inlets will feature a sound reduction index Dnew of 41 dB.

The ducting system will feature primary silencers on air intake and exhaust, as well as supply and return air. While the exact dimensions will of course depend on the geometry of the layout and the sound power level of the AHU, an indicative length of 2 m is common.

Secondary silencers will be needed in order to prevent sound transmission between spaces by means of the ducting layout. Once again, while the exact dimensions will of course depend on the geometry of the layout, an indicative length of 2 m using an absorptive flexible duct and junctions that are at least 2 m distant from each other is common.

Offices

If any, air intake inlets will feature a sound reduction index Dnew of 36 dB.

The ducting system will feature primary silencers on air intake and exhaust, as well as supply and return air. While the exact dimensions will of course depend on the geometry of the layout and the sound power level of the AHU, an indicative length of 2 m is common.

Secondary silencers will be needed in order to prevent sound transmission between spaces by means of the ducting layout. Once again, while the exact dimensions will of course depend on the geometry of the layout, an indicative length of 2 m using an absorptive flexible duct and junctions that are at least 2 m distant from each other is common.

In addition, there will probably be some smaller AHUs in subcompartments of the offices. The noise generated by these pieces of equipment that are usually located in the ceiling void depends, on the one hand, on the sound power level radiated by the equipment frame and shell, and on the other hand, on the sound power level generated by the air louvers, which are typically treated using 2 m of absorptive flexible duct (indicative length!).

In order to preserve the sound insulation properties of the ceiling, the air and lighting terminals will either be made of thick steel or be provided with an enclosure. Please note that a laboratory test report will be required from the contractor to prove compliance of the ceiling and terminal assemblies with the acoustic requirements.

 
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