Portacool Hazardous Location evaporative coolers are ETL Certified for use in Class I, Division 2, Groups C & D hazardous locations. This certification ensures Portacool’s Hazardous evaporative coolers are suited to provide cooling comfort that aids heat stress prevention among workers in high-heat environments where combustibles are a concern. These environments include petrochemical refineries, offshore and onshore oil/gas exploration, chemical production, fuel depots, garages or hangars where fuel is present. ETL hazardous location, Class 1, Division 2, Group C7D certified.