Air Cooling Hum Pads When air is moved by a ventilation, system goes through a wet Air Cooling Hum Pads, the Air Humidity increases.The energy that is lost in the evaporation of the water results in reduction of air temperature. Evaporative Cooling Pad is a natural process and is used throughout the world for following reasons. Specifications: Type: Pad Charging Cabinet Usage: Charging for Pad Installation: Floor Standing Fan Number: Three