This NSF Rated fixture is designed for cold-storage type applications, where temperatures are constantly below freezing. This LED exit sign is outfitted with a thermostatic battery heater that insures the unit can operate without any issue down to temperatures as low as -40 degrees F. This fixture can be used both indoors and out, in sleet and freezing rain.ConstructionThe freezer exit sign has rear backplate constructed with die cast aluminum, finished with a white, baked-on powder coat finish, which prevents rust and corrosion. The fixture mounts to most normally inflammable surfaces.The lens covering 'EXIT' and back housing are hermetically sealed with a silicone gasket to prevent water, vapor or dust leakage and gives this robust unit a NSF Food Service listing for splash zones.IlluminationThis model of the freezer exit sign includes choice of red or green Leis to illuminate the word 'EXIT'. Battery and UL TestingOur NSF Rated freezer exit sign includes a single Nickel-Cadmium battery that supplies emergency power for at least 90 minutes during a power outage.A thermostatic battery heater encases and maintains the battery's operating temperature range, keeping it functional in temperatures as low as -40 F.>FeaturesNEMA 4X and NSF Rated LED exit signFor use in cold-storage and freezing outdoor environments.Heavy duty cast-aluminum housing with a protective powder coat finish.Clear vandal-resistant polycarbonate lens with tamper-resistant screws.Fully gasketed enclosure protects from moisture ingress.UL Listed, meets UL924 Standards, NSF Certified, NEMA 4XDual 120/277VAC input.6 Volt 12 Watt Lead Calcium battery is included.