... /h,variable speed.3) Environmental ,Ventilation, Health - Use natural water cooling .4) Waranty 2 years for complete unit ,3yeats for motor ... . Multiple Function:Air cooler,Fan,Purifier and Humidifier.2. Honeycomb wed pad for optimum performance,which provides the largest contact area.3 ... is taking the fresh air as an input and using cooling pad as an air cooler and filtering, therefore the dust and ...