Environmental enclosure with 240 VAC heater for signaling appliance unit UL Listed to U.S. and Canadian safety standards and Type 4X Standards Now there is a way to protect your signaling device located where temperature or environmental conditions exceed the suggested operating range. This protective cover with heater assembly for strobe appliances, is UL/cUL Listed down to -70°F (-57°C) and Type 4X Rated. Thermostatically controlled 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.