... cooling fan 5.With CE Portable air cooling fan for factory OFFICE 1, Parameter ModelXBL-65YDMax air flow rate(m3/ ... 4. Removing dust and ventilation: Exhaust fan increase the air oxygen, filter the dust and smell, improve the air quality. ... functions of filtering,ventilation, air circulating, cooling, odor-dispellingand oxygen increasing suitable for open and half-open places. 4,Description ...