Ecō UL 924 Exit Sign, 100' Viewable Distance, Plastic Molded, Red, Double Face

Ecō UL 924 Exit Sign, 100' Viewable Distance, Plastic Molded, Red, Double Face

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UL 924 Rated Exit Sign - Double Face Red - 13" x 7.5" x .075". UL 924 rated signs specially tested for building standards compliance. In many jurisdictions, used in place of electrically powered exit signs. Signs rated for 100' line-of-sight viewing distances. This sign is approved for INTERIOR AND EXTERIOR USE and for exposure to direct sunlight and moisture.

Ecō UL 924 Exit Sign, 100' Viewable Distance, Plastic Molded, Red, Double Face

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  • Ecō UL 924 Exit Sign, 100' Viewable Distance, Plastic Molded, Red, Double Face


All DHi® UL 924 exit signs use strontium aluminate (SrAl), a much newer “Safety Grade” phosphor that is non-toxic and non-radioactive, and retain their ability to be recharged and glow brightly for many, many years. These signs have conformed with the standards outlined in UL 924, and have been tested and listed by Underwriters Laboratories Inc. Typically, the luminance life span is 30+ years for safety-grade strontium aluminate (SrAl) materials and only 3-4 years for novelty-grade zinc sulfide (ZnS) materials. Ease of installation and reduced maintenance costs make photoluminescent signs a cost effective alternative to traditional exit signs.

Cost Benefits

Exit signs are required by code and sometimes law. The vast majority of exit signs in use in the U.S. today are electrically powered. Electrical exit signs consume electricity 24 hours a day, 7 days a week and 365 days a year. They require frequent maintenance and component replacement. While new exit signs are limited to 5 watts per illuminated face, there are tens of millions of existing exit signs that consume far more electricity. In a single year, under the EPA’s current recommended standard, each electrically-powered exit sign can consume as much as 88 kilowatt-hours of electricity – ($8.80 at $0.10 per kilowatt-hour). Older types of electrically-powered exit signs can consume as much as 350 kilowatt-hours of electricity – ($35.00 at $0.10 per kilowatt-hour). Businesses, schools, hotels, hospitals, government facilities and other public buildings pay more than $1 billion every year to power these signs. Every electric Exit sign with a backup battery must be tested 12 times per year. Most exit signs still require manual testing. (Assumes 5 minutes per sign, 12 times per year and $10/hour labor cost.) Bulbs burn out, back-up batteries go dead and LEDs become dim. These parts and the labor to replace them add over $3 Billion more in cost each year. Building operators could be paying as much as $30-50 per exit sign per year just to keep them operating. There are two alternatives to electrically-powered exit signs: (1) tritium signs – these use no electricity, but contain radioactive gas, are expensive, and have a limited useful life along with a high disposal cost, and (2) photoluminescent signs. Underwriters Laboratories (UL) tested and listed photoluminescent exit signs. PL exit signs are:
  • Powered by absorbing ambient, fluorescent, and incandescent light.
  • Instantly visible when the ambient light goes out
  • Easily legible at the rated viewing distance after 90 minutes of darkness as required by UL
  • Safe, non-toxic and non-radioactive
  • 100% reliable with an expected lifetime of more than 30 years
  • Not reliant on external power or how well maintenance was performed
  • Non-explosive, so can be used in any environment
  • The ultimate “Green” exit sign


A full charge of 8 or more hours of luminance on DHi's photoluminescent materials is achieved by exposing the PL material to:
  • 3-4 minutes of ultraviolet (black) light, or
  • 7-8 minutes of direct sunlight, or
  • 21-23 minutes of fluorescent light, or
  • 24-26 minutes of incandescent light.

Building Code Requirements and Compliance

UL 924 exit signs comply with building requirements set forth by IBC, IFC, NFPA and NY local law 26-04.
NYC passed Local Law 26-04 that required photoluminescent marking systems in stairwells of all Class E commercial buildings over 75 feet tall within the city. This law applied to new construction starting on July 1, 2005. It also applied retroactively to over 1,600 existing buildings commencing on July 1, 2005 and to be fully implemented by June 30, 2006.
On May 24, 2007 the International Code Council voted to modify the International Building Code to include the NYC standard for photoluminescent path markings in the stairwells of most new high-rise buildings over 75 feet in height.
Many Building and Fire Codes are based upon the IBC 2003 and IFC 2003, respectively.
IBC 2009 (pending publication) Section 403.16 now requires Exit Path markings, and Section 411.7 now requires Exit signs and directional path markings (IAW UL 1994).
NFPA 2009 Section defines installation guidelines for Exit Stair Path Markings where required in Chapters 11 thru 42.
In all cases, you are advised to check with your local authorities. We can assist you in answering specific questions that result.

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