... airflow.Environmental, no freon,no compressor. Mini face Portable air coolerSpecificationAirflow:4000m3/h Power Supply:220V/50HZ Power Consumption: ... adopted, sufficient air quantity, high pressure, and effective noise inhibitionMotor: dust and moisture prevention, high quality dual sealed ... such as entertainment center, internet bar, waiting room, indoor games hall, hotel, restaurant, ect.If you want ...