There area unit 2 kinds of air distribution systems. the normal one – compounding ventilation, its main purpose is to expeditiously combine offer air with area air. The contaminants within the area area unit diluted by offer air and so extracted through the exhaust grill.
With displacement ventilation, the provision air temperature is slightly less than area air and provided at low rate directly into occupied zone. The impurities and warmth hundreds within the house area unit carried by Convective flows created by heat sources into the higher a part of the space. Air within the higher zone, having a better temperature, doesn\’t re-circulate back to the occupied zone. that\’s why the temperature and concentration of impurities at the exhaust outlet is more than within the occupied zone.