... optimum performance,which provides the largest contact area.3. Adjustable air level to your comfort.4. Mounted with castors for easy mobility ... therefore the dust and hot air are pushed away to the outside. It means there are Air Changing, Air Cooling and Oxygen (O2) ... of environmental, save energy and health ect. 4.Where to use Xiboli Air Cooler System1 For indoor using: home ,office,restaurant , ...