(1) "Indoor air quality ventilation" used mainly to provide fresh, heated or cooled air to buildings as part of the heating, ventilating and air-conditioning system,
(2) "Dilution ventilation" which dilutes contaminated air in a whole building or room by blowing in clean air and exhausting some dirty air,
(3) "Local exhaust ventilation" which captures contaminate emissions at or very near the source and exhausts them outside.
Indoor air quality ventilation, used primarily in offices and other non-industrial buildings, will not be covered in this guideline.
There are advantages and disadvantages to the use of either dilution ventilation or local exhaust ventilation in terms of costs and effectiveness.
