1,48 In. Portable Air Cooler 2,Cools 4,000 sq. ft/ 3,high performance ... environmental protection, evaporated with water without harmful refrigerants5. Fresh air 0-20,000 CFM, cools 4,000 sq ft. ... air hangers, livestock, warehousing, production lines, school events, outdoor dining, athletic fields, outdoor events, auto auctions, dry cleaners, greenhouse,etc. Industrial Portable evaporative air cooler ...