(Refurbished) Ecohouzng 4-in-1 Evaporative Air Cooler - BlackThe Ecohouzng Evaporative Cooler is the smart cooling solution for your house or office. In terms of efficiency the TOSOT Evaporative Cooler can be much better than traditional air conditioners, and also requires no window ventilation tubing. An air cooler, fan, humidifier and purifier rolled into one, this unit makes use of higher wind volume to produce naturally healthy cool air. Dual centrifugal blower + Ball bearing Motor(100% copper) Air flow