1.2 Acoustics and Vented Facades

When naturally ventilating a building on a noisy or moderately noisy site the acoustic design of the facade becomes fundamental. The ability to provide high levels of sound resistance within a limited depth is often a requirement for an attenuator in the facade of a building. Due to the honeycomb structure and the performance of the acoustic foam, the NAT Vent Attenuator provides an exceptionally slim line attenuator with an outstanding acoustic performance. The size and depth of the NAT Vent Attenuator is dependent upon two main factors;

1 The free/open area specified by the M&E consultant/engineer. This governs the required face area of the attenuator and its percentage free area. A large face area will transfer a greater level of sound into a room, hence the depth of the attenuator is required to be lengthened such to resist the increased level of sound power.

2 The second factor affecting the depth of the attenuator is the required level difference between the environmental noise and the required internal noise level. The greater the difference, the longer the attenuator. To design and test the NAT Vent Attenuator, MACH Products has an in-house calibrated test rig to BS EN ISO 7235:2003.  This test facility enables MACH Acoustics to design and test a range of options during Design Stages C, D and E of a project.  The NAT Vent Attenuator is then manufactured to fit into a given location, as well as meeting the buildings ventilation and acoustic requirements.

See Chapter 2 and our website, www.machproducts.co.uk for further details.