Environmental enclosures with 110 VAC heater for signaling appliance unit UL, cUL and Hazardous Listed to NEMA 4X Standards. Now there is a way to protect your signaling device located where temperature or environmental conditions exceed the suggested operating range of your strobe. Thermostatically controlled 110 VAC heater and a continuous duty fan maintain a uniform temperature in the cover when located in a cold environment. Applications include, but are not limited to, refrigerators, freezers, meat packaging plants, arctic environments, ocean rigs, slaughter houses, etc. UL Listed down to -70 degF -57 degC.