Ventilating is the process of changing the air in the room was new air pollution outdoors, the purpose of ventilation is: Discharge of toxic gas, excess heat and excess moisture outside, provide the necessary oxygen forthe human body

Ventilation has two forms of natural ventilation and forced ventilation:

+ Natural ventilation is the phenomenon of exchange of indoor and outdoor air in the column pressure difference

+ Forced draft ventilation process by external forces ie using ventilation fans