How to choose Exit Signage?

Although there are no specific codes that favor one style of emergency exit sign over another, installation and design criteria may.

Exit sign
Exit sign

LED Exit signs that use tritium or photoluminescence are listed and tested the same way as electric exit signs. In some ways, all illuminated exit signs are the same. However, a detailed examination of less visible criteria can assist installers, and building owners make informed decisions that cut overall costs, reduce maintenance requirements, and ensure that signs comply with local legislation.


If you're looking to buy or already own an exit sign, chances are it's one of three types:


  1. Electric: These signs are connected to a building's electrical supply and illuminated with backup power in the case of a power outage. In addition, they might have emergency lights on the top or sides to help with the evacuation.


  1. Photoluminescent: Light-absorbing materials collect light particles and emit them as a greenish slow. These signs have non-illuminated parts that contrast with the luminous material to form the letters, arrows, and symbols required by life safety codes. When the building is occupied, most rules require that they be charged with a good electric light source to be completely illuminated.


  1. Radioluminescence: Tritium is a radioactive gas that produces a red or green glow when interacting with light-emitting substances. These signage do not require energy or UV rays; however, they have higher upfront and disposal costs.


Are there any forms of emergency escape indicators required by life safety codes?


Electric exit signs are not required by NFPA 101 or the IBC. Similarly, neither the codes require the photoluminescent nor the tritium exit signs. However, related sign kinds, such as the door- and wall-mounted egress signs that fill in the gaps between, may require illumination without the use of power. Installers have the freedom to select the most cost-effective, convenient, and safe option. However, all new internally lighted exit signs must be listed under UL 924, including most electric, radio luminescent, and photoluminescent varieties. The UL sign is used to identify these models, as illustrated below.


Some local rules mandating colorful letters may prohibit the use of photoluminescent exit signs.


The National Fire Protection Association (NFPA) and the Occupational Safety and Health Administration (OSHA) do not mandate a specific hue for exit signs as long as the color choice does not obstruct visibility. The IBC doesn't either. Most signs already have the two most frequent colors, red and green.


However, certain places demand that you wear red or green. For example, the text and arrows on emergency exit signs must be red and placed against "a white translucent field," according to the municipal code of Chicago, Illinois. 


Exit Sign

When it comes to photoluminescent signage, it's very crucial to pay attention to these specifications because:
  • Even if the sign contains red or green components, the light-absorbing parts tend to shine in white or green hues.


  • The sign could be a positive-image type (where the letters and symbols illuminate) or a negative-image type (where the background glows).


Local codes may not allow contractors to choose sign colors, but model codes may. 


Before making a purchase, check with your authority having jurisdiction (AHJ)—usually, but not always, the fire marshal.




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