The ventilation method of discharging polluted indoor air to outside and diluting the polluted indoor air by bringing in fresh air with a purpose to prevent a fire or explosion, and adjust the indoor temperature, humidity and CO2 concentration

• The volume of ventilation for a dilution ventilation system should be determined after first reviewing the data based on literature study or experience so that the pollutants can be sufficiently diluted.
• The air outlet should be installed near the pollution source to the maximum so that spot ventilation effect similar to that of local ventilation can be achieved.
• The locations of the air inlet and outlet shall be selected to allow the supplied air to first pass through the area of the worker and then the pollution area before being discharged.
• As a big volume of air is ventilated by a low pressure axial fan in many cases of total ventilation in general, sufficient air should be supplied using a Makeup Air System in order to maintain the efficiency of the ventilation system.
• If there are other work processes near the pollution source, the pollutant should be prevented from spreading over the other workers by supplying a little more air than discharged to maintain a negative pressure, and, on the other hand, if there are no other work process in the vicinity, the air discharged shall be a little more than the volume of air supplied.
• Re-entry of the discharged pollutants should be prevented by installing the air outlet at an appropriate height near the roof or a certain distance away from windows.

• Works with strong mobility
• The case in which pollution sources are scattered across the whole workplace
• Dilution ventilation of harmful materials with a low toxicity or low concentration
• Prevention of a fire or explosion
• Management of the heat inside the workplace