ETL CERTIFIED explosion proof air conditioners, explosion proof air conditioning, explosion proof HVAC, explosion proof air-con, hazardous location air conditioners, hazardous duty air conditioners, flameproof air conditioners, explosion proof heaters, stainless steel air conditioners, industrial air conditioners, military air conditioners, military air conditioning, A/C, pressurization units, pressurizing units, explosion proof fans, ventilation fans and other equipment for hazardous locations in petrochemical, refining, pulp, paper, and offshore industries, UL, CSA (C/US).