UL 924 EXIT SIGNS according to NFPA 101

Photoluminescent exit signs are governed by the UL 924 standard. Photoluminescent signaling receives a display distance rating of 50, 75, 100 or 125 feet according to the visibility test procedures. After the photoluminescent material has been exposed to light for one hour, the exit signs must be visible in the dark from a certain distance for at least 90 minutes, similar to the electric powered exit signs.


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