Assessing Exhaust Re-Entrainment

Fresh-air supply is the lifeline of a building, affecting indoor air quality, health and comfort of building occupants. The fresh air supply system will exist for the lifetime of the building, yet it is often overlooked as a critical design aspect. Although the design of mechanical exhaust systems are intended to remove and discharge unwanted or hazardous emissions away from buildings, these air contaminants often find their way back into the building due to interactions with the wind. Re-entrainment of these unwanted contaminants compromises air quality.