... design Low noise Dynamic Compact Semiconductor Fan Heater, Industrial Electric Air Heater, CSL 028, 150W,250W,400WCompact designLow noiseDynamic ... an evenly distributed interior air temperature in enclosures with electric/electronic components. The heater is connected using the internal ... accordance with UL508A Compact Semiconductor Fan Heater, Industrial Electric Air Heater, CSL 028, 150W,250W,400W