Soler & Palau TD-100XS In-line Exhaust Fan Class I electrical insulation IP 44 Protection Thermal Overload Protection Class B Motor Insulation Sealed for Life Safety tested by Underwriters Laboratories, Inc. and are UL and cUL Listed. ETL Listed 4'' or 5'' Inline mixed flow duct fan-H: 203 cfm, L: 108 cfm