The XEU1 series of explosion-proof electric unit heaters are designed to meet U.S.A. and Canadian certification standards (cCSAus) and the spark-resistant fan assembly is also compliant to AMCA 99-10, Type B. The three sizes of XEU1 heaters include our ExCaliber™ high performance liquid-to-air heat-exchanger cores that are available in 35 model choices of voltage and heat output combinations to meet your specific hazardous location requirements.