Evaporative Cooling Systems

This kind of system is also ventilation system in which the fresh air is being made to pass through a wet mist of water either through spray or cell dek pads wherein the dry bulb temperature is considerably reduced and cooled air ( usually at a temperature less than by 5 to 7 degree Celsius than the ambient air) is pumped into the department either by an axial flow fan or centrifugal fans and ducting and grilles.

This effectively reduces the room air temperature.
Usually exhaust is also employed for effective results.