In general, exit signs should only need to be replaced every 8-10 years. However, most indoor models will degrade quickly if placed outdoors in harsh weather elements like snow and rain. Weatherproof exit signs are built for such purposes.
Like all exit sign fixtures, these wet location exit signs must stay lit at all times, marking the egress points for personnel to follow to a safe rally point during an emergency. Weatherproof units will continue to burn brightly for 90 minutes after AC power goes out.
Weatherproof exit signs can be employed in exterior locations exposed to rain, sleet, snow and cold weather. Also applicable for indoor washdown areas. May be fitted with an internal battery heater for near-freezing conditions.
The WPX models have a corrosion-resistant ABS plastic housing and a clear polycarbonate faceplate to protect the 'exit' lettering. The faceplate is shatter-resistant and lined with a gasket to form an airtight seal when fastened.
Green or red 'exit' lettering is lit by LED (Light Emitting Diode) strips that consume less than 5 watts of electricity. The internal nickel cadmium (NiCad) battery powers the sign for at least 90 minutes after external power goes out.
Five-year warranty on parts and battery.
OSHA requires the backup battery to be tested once a month and once yearly. This diagnostic is performed via a sealed test switch. Batteries should be drained and refilled every six months to extend battery lifespan.
Components are expected to last 8 to 10 years. Battery typically lasts five years.