NEGATIVE PRESSURE VENTILATION SYSTEM(CONTROLLED HOUSE)
Most modern controlled environment housing uses negative pressure ventilation. This means that fans exhausts air out if the house and fresh air is drawn into the house through air inlet. this is called negative pressure ventilation because it works by creating a partial vacuum in the house.
when a negative pressure is created in the house fresh outside air enters evenly through the all inlets in the house.as negative pressure increases ,so the speed of the air entering the house increases.in this way pressure can be regulate the speed of the incoming air and how far the air will uniformly travel into the house before it turns and move toward floor level.negative pressure only works efficiently if the house is effectively sealed. in a house that is effectively sealed against air leaks all the air entering the house comes in through the desired air inlets and uncontrolled air leakage will be minimized.
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