Investmech analyses and optimise ventilation systems using Monte-Carlo or Nelder-Mead analyses, depending on the requirements. Investmech did the sizing of the ducts, fans and sound attenuation for the Gautrain underground stations and emergency shafts.
ASHRAE recommended loss factors were used and SANS standards for noise control..
Ventilation system noise control
The table below is an extract from one of the Investmech ventilation system noise control reports. Investmech applies international and national standards to ensure that ventilation systems do not produce annoying noise in the system area and the surrounding environment