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Exit Signs

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Exit Sign Code Requirements: NFPA 101, UL 924, and OSHA

An exit sign purchase is a compliance decision before it is a product decision, so the code facts come first. These are the citations facility managers copy into work orders:

  • NFPA 101, Section 7.10 governs means-of-egress marking: signs at exits and along the egress path wherever the way to the exit is not obvious, illuminated at all times the building is occupied.
  • UL 924 is the product listing for emergency lighting and exit equipment; a listed sign meets the visibility and 90-minute emergency operation tests. Buy UL 924 listed, full stop.
  • OSHA 29 CFR 1910.37(b) requires exit route signage with the word "Exit" in plainly legible letters at least six inches high with principal strokes at least three-fourths of an inch wide.
  • Battery-backed operation must carry the sign through at least 90 minutes of power failure, per UL 924 and NFPA 101's emergency illumination provisions, unless the sign is served by a generator or central inverter.

Red or Green Exit Signs: The Jurisdiction Question

National codes do not mandate a letter color; the authority having jurisdiction does. Red dominates most of the United States, while a number of jurisdictions, and many legacy buildings in the Northeast and Midwest, require green. The practical rule: match the existing signs in the building, and on new construction confirm color with the local AHJ before ordering a caseload. Most models in this category ship in red or green versions of the same housing, so the spec change costs nothing if it is caught early.

Choosing an LED Exit Sign: Four Decisions

LED exit signs draw 2 to 5 watts and have collapsed the maintenance argument that surrounded older lamp technologies. What is left is a four-decision spec, and the whole category sorts along these lines:

DecisionOptionsPick It When
Letter colorRed or greenSet by the AHJ; match the building's existing signs
Faces and mountingSingle or double face; wall, ceiling, or end mountDouble face and end mount for corridor sightlines; single face above door frames
PowerAC-only, battery backup, or photoluminescentAC-only for generator or inverter-served circuits; battery backup everywhere else; photoluminescent where a no-power backup is specified
DiagnosticsManual test switch or self-testingSelf-testing for portfolios where monthly manual testing labor outweighs the unit premium

Nearly all commercial units accept universal 120/277V input, and most ship as universal-mount kits with knockout face plates and canopies covering all three mounting positions from one carton. Edge-lit models serve lobbies and finished spaces where a slim acrylic panel fits the architecture better than a thermoplastic box.

Monthly and Annual Exit Sign Testing

NFPA 101 requires a monthly functional test and an annual full-duration test on battery-equipped units, and inspectors ask for the records. The working checklist:

  • Monthly: press the test switch for 30 seconds, confirm the sign stays illuminated on battery, check the charging indicator LED, and verify the face is clean, legible, and unobstructed.
  • Annually: run a full 90-minute discharge test and confirm illumination holds for the entire period; replace the battery on any unit that drops out early.
  • Log every test with date, unit location, and result; keep records available for the AHJ.
  • Self-testing models run these cycles automatically and flag failures on an indicator, converting the monthly walk-through into an exception check, which is the economic case for them across large building portfolios.

Completing the Egress System

Exit signs mark the path; illuminating it is a separate code requirement covered by Emergency Lights. Where one fixture should do both jobs, Exit and Emergency Combo Units pair the sign with adjustable lamp heads. Buildings running egress loads on central power use Emergency Lighting Inverters, and replacement batteries and boards live in Exit and Emergency Light Parts. Project-quantity pricing and spec assistance are available on request.

Frequently Asked Questions

NFPA 101 Section 7.10 requires illuminated signs marking exits and the egress path wherever the route is not obvious, visible whenever the building is occupied. OSHA 29 CFR 1910.37(b) requires the word Exit in letters at least six inches high with three-quarter inch strokes. Buy UL 924 listed units, and confirm any local amendments with the authority having jurisdiction.

Exit signs must remain illuminated during a power failure for at least 90 minutes. Battery backup is the standard way to meet that, and it is built into most commercial LED units. The exception is a building where egress circuits are served by an emergency generator or a central lighting inverter, in which case AC-only signs on those circuits satisfy the requirement.

National codes do not fix a color; the local authority having jurisdiction does. Red is the most common requirement across the United States, while some jurisdictions and many older buildings in the Northeast and Midwest standardized on green. Match the building's existing signs, and on new work confirm the color with the AHJ before ordering, since most models come in both.

NFPA 101 calls for a monthly functional test, typically 30 seconds on the test switch confirming battery operation, and an annual test running the full 90-minute discharge. Results must be logged and available to the inspector. Self-testing models run both cycles automatically and flag failures on an indicator LED, which removes the manual testing labor on large buildings.

A self-testing unit has onboard electronics that automatically run the required monthly and annual battery discharge tests, then report the result on an indicator LED. Staff walk the building checking for fault indications instead of pressing test switches on every unit. Across a large portfolio the labor savings typically outweigh the modest price premium within the first year or two.

Modern LED exit signs draw roughly 2 to 5 watts while meeting UL 924 visibility requirements. Running continuously, a single unit costs only a few dollars a year in energy, and LED source life typically spans many years of continuous operation. That efficiency is why LED retrofit kits for older incandescent signs pay back quickly across a building with dozens of units.

A photoluminescent sign uses a phosphorescent face that charges under normal ambient lighting and glows visibly when power fails, with no wiring, batteries, or energy use. Codes permit them where the sign's face receives the minimum specified light level during occupancy, and some specifications call for them as a no-power backup layer. They complement, rather than universally replace, electrically illuminated signs.

A combo unit pairs an illuminated exit sign with adjustable emergency lamp heads in one housing, on one circuit connection, with one battery. It covers both the marking requirement and the egress path illumination requirement at a door or corridor junction, which saves a fixture and an installation point. Combos are the default choice at back-of-house exits in most commercial buildings.