Indoor air quality ventilation 

Air quality systems draw in fresh air, which is heated or cooled and filtered by your

HVAC system before distribution throughout your building.
 

Dilution ventilation

 Dilution systems use an exhaust and intake to remove contaminated air and slowly
replace or dilute it with clean, fresh air.
 

Local exhaust ventilation 

Used at or near the source of contaminants, local exhaust systems directly draw out contaminated

air through a system of ducts and release it outside through an exhaust stack, typically after it has been filtered and cleaned to remove pollutants, such as welding gases, dust, or airborne particles.