Ventilation stacks are often used to provide cross ventilation. The drawback of this system is that if multiple floors are ventilated in this way, multiple ventilation stacks are required to prevent cross talk. The NAT Vent Attenuator can be incorporated into the ventilation stack such to prevent cross talk, allowing a single ventilation stack to feed multiple floors. This is an exceptionally cost effective and space saving method of achieving cross ventilation.
Please see page 31 ‘Cross Vent Using a Single Ventilation Stack’ of the MACH Acoustics book.