1.1 Introduction

The NAT Vent Attenuator has been designed to overcome the clashes between natural ventilation and acoustics. The NAT Vent Attenuator allows the fl ow of air into and through a building, whilst preventing the passage of sound. This product can easily be incorporated into the facade of a building, allowing for natural ventilation on all sites, irrespective of environmental noise levels. The NAT Vent Attenuator can also be used to prevent cross talk issues when implementing cross ventilation to atriums/corridors. This product can be made to comply with BREEAM, BCO, HTM, BB93 and other standards. 

The concepts and design specifi cations for this product have come from MACH Acoustics consulting experience. Our experience has shown that current products have a limited acoustic performance, are exceptionally infl exible, costly, and are lacking in technical innovation. Through frustration, knowledge and insight, the NAT Vent Attenuator has been designed and produced by MACH Products. The NAT Vent Attenuator is formed from W shaped tiles manufactured from acoustic foam. These elements are then tessellated and stacked together 11, 12 to form the NAT Vent Attenuator 13. The result is a fl exible product which can be fitted into bulk heads to allow for cross ventilation, or incorporated into the facade of a building to prevent noise break-in. 

The key features of the NAT Vent Attenuator are its patented technology based around the honeycomb structure, its novel W shaped splitter arrangement and the materials from which it is made. A simple manufacturing process delivers a cost effective, lightweight product, which is exceptionally flexible and therefore can be made to fit into a wide range of spaces and locations. The NAT Vent Attenuator is designed and manufactured bespoke for each project and tested using MACH Acoustics in-house test facilities 14 meaning that the acoustic specifi cation of this product meets the exact project requirements.