... Air Heater, CSL 028, 150W,250W,400W Compact design Low noise Dynamic Compact Semiconductor Fan Heater, Industrial Electric Air Heater, ... )Protection type / Protection classIP20 / II (double insulated)ApprovalsUL File No. E150057 (according to UL 499, intended for the use ... the use within an enclosure in accordance with UL508A Compact Semiconductor Fan Heater, Industrial Electric Air Heater, CSL 028 ...