Compact Semiconductor Fan Heater, Industrial Electric Air Heater, CSL 028, 150W,250W,400W Compact design Low noise Dynamic Compact Semiconductor Fan Heater, Industrial Electric Air Heater, CSL 028, 150W,250W,400WCompact designLow ... for the use within an enclosure in accordance with UL508A Compact Semiconductor Fan Heater, Industrial Electric Air Heater, CSL 028, 150W,250W,400W