PORT-A-COOL HAZARDOUS LOCATION EVAPORATIVE COOLER 36" Evaporative Cooler This evaporative cooler is sealed to prevent sparking and accidental explosion in highly combustible areas. Swamp coolers help increase worker productivity by making a more comfortable and safe working environment. Durable one-piece molded plastic polyethylene housing with leak-resistant, one-piece molded plastic internal water tank. Water supplied to internal tank through standard 3/4" hose. Energy efficient variable speed belt drive motor and pump. This portable evaporative cooler includes 4" heavy-duty plastic swivel casters (2 with brakes) for easy mobility. Hazardous Location protection for Class 1, Division 1, Groups C & D. This 36" Evaporative Cooler features a 20 gallon water tank, 1/2HP motor and delivers 9,600 CFM. Provides a cooling area of up to 2,500 sq. ft. Horsepower rating based upon maximum speed/load.