Under Floor > Under Floor
Installing the NVA under-floor is a very effective method when dealing with high noise levels.
The vent openings are made within the spandrel panel between transoms. Air passes into the cellular space by passing through a external vent opening, through the NAT Vent Attenuator. The floor void is used as plenum - air enters the rooms above by means of floor diffusers. MACH can design the NVA around your choosen flooring, such as the Kingspan modular system - enabling the NVA to follow the grid formation.
Due to the bespoke nature of the NVA, the attenuator can be simply installed in coordination with a modular grid based flooring. The NVA segments are slid into place between the pedestals (1/4 circle sections were added to the corner profile to account for the structure), followed by the matching 600x600mm floor sections.
Building services often exist within the flooring void, including a heated element in this case. The NVA foam can be easily adapted on site to accommodate for these items, unlike a common pre-defined attenuators.
Under floor areas typcially have building services running through them. The NVA foam can be simply cut to accomdate these services, saving construction time and costs.
The Law Court at the University of Hertfordshire is a £10M building with advanced facilities, including a full-scale courtroom with public gallery, a working law clinic, a purpose built mediation centre and a dedicated CPD suite, as well as a large number of offices and classrooms. Aiming for BREEAM status, the building was to be naturally ventilated. MACH Acoustics provided a vented facade solution using weather louvres, connected to a raised, vented floor containing the NVA.
Under Floor > Installation Images
Chimneys > Chimney Details
A single chimney can be built into the corner of a room, which propogates through the floors of the building and through a ventilation tower on the roof. The NAT Vent Attenuatored is used between floors to avoid cross talk between rooms. Air can flow into the building through openable windows or a NVA facade feature and cross ventilate through the central chimney.
Quick, simple and adaptable Installation is one of the key benefits of the NVA. The process is broadly the same for most applications. The tessellating foam is arranged into honeycomb pairs by alternating orientation, then simply slid into the duct. Since the foam is malleable and can be cut, fitting around building services or any on-site alternations can be easily achieved. Installation generally takes under one hour - saving money and construction time.
For a chimney installation, the NVA is placed between the wall partition, supported by the metal frame of the walling. Bulkheads can be built a ceiling level to provide inlets for the chimney - a 90deg bend such as the diagram aids the acoustic attenuation. YouTube Demo
Llwynderw Primary School is a project in Abergaveny that MACH Acoustics worked on in partnership with Stride Treglown Architects and Willmott Dixon. The school incorporates natural ventilation through a vented facade and openable windows, which cross ventilate classrooms via a central chimney - saving money, building space and simplifying the construction.