To maintain a pleasant working environment, it is important to circulate ‘fresh’ air from outside the building. The ventilation component of an HVAC system is designed to regulate air intake from outside the building to improve the overall quality and even oxygen content of the air inside.
For “clean room” type environments, the choice of ventilation system is crucial. Filtration systems will help to eliminate particulates, fumes and moisture that could contaminate a controlled environment.
In most cases, the ventilation aspect of an HVAC installation will use ‘forced’ or ‘mechanical’ systems to draw air in from outside the building and push it out through the air conditioning ducts. An air handler is used to control the quality of air inside, pulling in fresh air when required, and expelling stale air via a ventilation exhaust unit, typically mounted on the roof of the building.