Ambient lights sources giving illumination to exit signs other than the electrical exit signs must have screens discs or lenses of not less than 25 square inches area made of translucent material to confirm contrast.
Exit light dimensions.
Exit signs must be properly illuminated by a reliable light source with a minimum of 5 foot candles on the illuminated surface.
The following information should help your company building owners and whoever is responsible for exit sign requirement oversight become completely aware of exit sign size requirements.
Existing externally illuminated exit signs having the word exit in plainly visible letters not less than 4 1 2 inches high in existing buildings other than in places of assembly may be continued in use.
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As you are aware nfpa 101 was modified by the nfpa in 1973 to include an exception to the size of the lettering.
Tall streamlined design is great for above the door applications and other tight fits.
The occupational health and safety administration controls the standards for emergency lighting in the united states.