OSHA Exit Sign Requirements: Complete 2026 Guide
Quick answer: OSHA requires each exit to be clearly visible and marked "EXIT." EXIT lettering must be at least 6 inches high with principal strokes at least ¾ inch wide, and each sign must meet the illumination requirements (5 foot-candles for externally lit signs). Directional signs are required wherever the route to the exit isn't immediately apparent, and misleading doors must be marked "Not an Exit" or by their actual use. Final review by a qualified safety professional, fire marshal, or AHJ is required.
Related guides: free evacuation map generator, fire evacuation map requirements, where to post maps, what to include on an evacuation map, pre-task plan template.
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OSHA Exit Sign Requirements at a Glance — 29 CFR 1910.37(b)
Every subsection employers must meet for exit-route marking and lighting
Exit Route Lighting
Each exit route must be adequately lighted so that an employee with normal vision can see along the route.
Every Exit Marked "EXIT"
Each exit must be clearly visible and marked by a sign reading 'Exit.'
Exit Doors Free of Obscuring Decorations
Each exit-route door must be free of decorations or signs that obscure the visibility of the exit-route door.
Directional Signs & Line of Sight
If the direction of travel to the exit or exit discharge is not immediately apparent, signs must indicate the direction of travel — and the line of sight to an exit sign must be clearly visible at all times.
"NOT AN EXIT" Marking
Each doorway or passage that could be mistaken for an exit must be marked 'Not an Exit' or by a sign identifying its actual use (e.g., 'Closet,' 'Storage').
Sign Illumination
Each exit sign must be illuminated to at least 5 foot-candles (54 lux) by a reliable light source; self-luminous or electroluminescent signs need a minimum luminance of 0.06 footlamberts (0.21 cd/m²).
EXIT Letter Size
The word 'Exit' must be in plainly legible letters not less than 6 inches high, with principal strokes at least 3/4 inch wide.
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- EXIT lettering dimensions & sign specs at a glance
- Illumination, visibility & directional-sign checks
- NOT AN EXIT doors and exit-route obstructions
- Common exit-sign citations to avoid
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OSHA Exit Sign Size Requirements
What 29 CFR 1910.37(b)(7) actually requires — and what it doesn't
The word "EXIT" must be in plainly legible letters not less than 6 inches (15.2 cm) high.
The principal strokes of the letters must be at least ¾ inch (1.9 cm) wide.
How High Does an OSHA Exit Sign Need to Be?
People searching "exit sign height" often mean two different things. OSHA 1910.37(b)(7) specifies the minimum letter dimensions, not a universal mounting height for every building. Where your signs must be mounted typically comes from the adopted building and fire codes — such as the IBC or NFPA 101 — and the local authority having jurisdiction (AHJ). When in doubt, confirm mounting height with your local fire marshal.
OSHA Exit Sign Lighting & Illumination Requirements
Three related — but distinct — requirements to keep straight
Exit Route Lighting
The exit route itself must be adequately lighted so an employee with normal vision can see along the route.
Exit Sign Illumination
Each exit sign must be illuminated to at least 5 foot-candles (54 lux) by a reliable light source. Self-luminous or electroluminescent signs need at least 0.06 footlamberts of luminance.
Backup / Emergency Power
The common 90-minute battery-backup requirement comes from NFPA 101 Life Safety Code, enforced by most local fire codes — keep it distinct from OSHA's subsections when auditing.
OSHA Directional Exit Sign Requirements
Under 29 CFR 1910.37(b)(4), if the direction of travel to the exit or exit discharge is not immediately apparent, signs must be posted along the exit access indicating the direction of travel to the nearest exit. The line of sight to an exit sign must also remain clearly visible at all times — a directional sign that's blocked by shelving or displays doesn't count.
In practice this means EXIT signs with arrows at corridor turns, intersections, and anywhere a visitor couldn't instantly tell which way to go.
Need to check where your directional signs belong? Upload your floor plan → check exit routes
OSHA "NOT AN EXIT" Sign Requirements
Under 29 CFR 1910.37(b)(5), any door, passage, or stairway that is neither an exit nor a way of exit access — and is located in an area where it could be mistaken for an exit — must be marked "Not an Exit" or identified by its actual use.
When is a NOT AN EXIT sign required?
Whenever a door or passage could reasonably be mistaken for an exit during an evacuation — especially doors along exit corridors.
Can I label the door "STORAGE" instead?
Yes. Identifying the door by its actual use — "STORAGE," "MECHANICAL ROOM" — is equally compliant and often more informative.
Do restroom doors need NOT AN EXIT signs?
Only if they could be mistaken for an exit — a restroom door on an egress path is a common example. A "RESTROOM" label satisfies the rule.
What about mechanical rooms?
Mechanical and electrical rooms near exits are frequent culprits — label them by their use or "NOT AN EXIT."
What about elevators?
Elevators are not exits. Elevator lobbies that could be confused with an exit path should be clearly identified.
Both "NOT AN EXIT" and actual-use labels are OSHA-aligned
Do OSHA Exit Signs Have to Be Red or Green?
OSHA's general-industry rule requires exit signs to be of a distinctive color and clearly visible — it does not state that every exit sign in every workplace must be either red or green. Adopted building and fire codes and local requirements can restrict permitted sign colors, which is why red and green dominate US workplaces: they're the standards local AHJs expect. OSHA's own rule addresses visibility, illumination, and distinctive color — check your local fire code before assuming either color is mandatory.
How Many Exit Signs Are Required?
There isn't a simple universal rule of "X signs per Y square feet." OSHA requires each exit to be clearly marked "EXIT," directional signs wherever the path to an exit isn't immediately apparent, and a clear line of sight to an exit sign along the route. Separately, OSHA generally requires at least two exit routes in a workplace (29 CFR 1910.36(b)) unless an exception applies based on workplace size, occupancy, and arrangement.
10 Common OSHA Exit Sign & Exit Route Violations
Each maps to a specific 1910.37 requirement inspectors check
❌ Exit not marked EXIT
A designated exit with no sign at all — the most basic and most cited exit-marking violation.
❌ Exit door obscured by decorations or signs
Posters, decorations, or other signs that hide the exit-route door itself from view.
❌ No directional sign where the route isn't obvious
Corridors that turn or branch without a directional EXIT sign showing the way.
❌ Exit sign not clearly visible
Line of sight to the exit sign interrupted by equipment, inventory, or hanging displays.
❌ Misleading door not identified
Storage, mechanical rooms, or dead-end stairways that look like exits but carry no 'Not an Exit' or actual-use label.
❌ EXIT lettering undersized
Letters under 6 inches high or strokes under 3/4 inch — unreadable at distance, especially in smoke.
❌ Exit sign inadequately illuminated
Burned-out lamps, dead batteries, or less than 5 foot-candles on the sign face.
❌ Exit route poorly lighted
The route itself is too dark for an employee with normal vision to follow.
❌ Exit route obstructed
Materials, equipment, or locked doors blocking the path of travel to the exit.
❌ Backup illumination not working
Signs that go dark in a power outage — NFPA 101 emergency lighting calls for 90 minutes of backup, enforced by most local fire codes.
How Many Does Your Facility Have?
Types of Exit Signs
Choose the right exit sign type for your facility
Internally Illuminated
Most common in new constructionLED or fluorescent lighting within the sign body. Energy efficient, typically UL 924 listed, and available with built-in battery backup options.
Advantages
- Low energy cost
- Built-in battery backup
- Long LED lifespan (50,000+ hours)
- Uniform illumination
Externally Illuminated
Common in existing buildingsSign face lit by external light fixtures providing at least 5 foot-candles on the sign surface (1910.37(b)(6)). Pair with emergency lighting per NFPA 101 / local code.
Advantages
- Low initial cost
- Easy to replace sign face
- Compatible with existing fixtures
Self-Luminous (Tritium)
No power requiredContains tritium gas tubes that glow without electricity. Must meet the 0.06-footlambert minimum luminance for self-luminous signs (1910.37(b)(6)). No wiring, no batteries; lifespan of 10-20 years.
Advantages
- Zero electricity needed
- No maintenance
- Works in any condition
- NRC licensed
Photoluminescent
Charging light requiredAbsorbs ambient light and glows in the dark. Must be charged by reliable light source. Meets UL 924 when properly installed.
Advantages
- No electricity needed
- Eco-friendly
- Low cost
- Code-compliant in many jurisdictions
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OSHA Exit Sign Requirements FAQ
The questions people actually search about exit sign compliance
Are exit signs required by OSHA?
Yes. OSHA 29 CFR 1910.37(b)(2) requires each exit to be clearly visible and marked by a sign reading 'Exit.' In addition, 1910.37(b)(4) requires directional signs along exit routes wherever the direction of travel to the exit or exit discharge is not immediately apparent.
What size must EXIT letters be?
Under OSHA 29 CFR 1910.37(b)(7), each 'EXIT' sign must have the word 'Exit' in plainly legible letters not less than 6 inches high, with the principal strokes of the letters at least 3/4 inch wide. Note this is the required size of the EXIT lettering — not a mounting height for the sign itself.
Does OSHA require red or green exit signs?
No. OSHA's general-industry rule requires each exit sign to be of a distinctive color and clearly visible — it does not mandate that every exit sign be red or green. Adopted building and fire codes (such as IBC or NFPA 101) and the local authority having jurisdiction can restrict permitted colors, which is why red and green are the common standards in US workplaces.
Do OSHA exit signs have to be illuminated?
Yes. OSHA 29 CFR 1910.37(b)(6) requires each exit sign to be illuminated to a surface value of at least 5 foot-candles (54 lux) by a reliable light source. Self-luminous or electroluminescent signs with a minimum luminance surface value of at least 0.06 footlamberts (0.21 cd/m²) are also permitted.
When are directional exit signs required?
Under OSHA 29 CFR 1910.37(b)(4), if the direction of travel to the exit or exit discharge is not immediately apparent, signs must be posted along the exit access indicating the direction of travel to the nearest exit. The line of sight to an exit sign must be clearly visible at all times.
What is a NOT AN EXIT sign?
OSHA 29 CFR 1910.37(b)(5) requires that each doorway or passage along an exit access that could be mistaken for an exit must be marked 'Not an Exit' or with a sign identifying its actual use — such as 'Closet' or 'Storage.' This prevents occupants from wasting critical time on doors that don't lead to safety.
What doors need NOT AN EXIT signs?
Any door that could reasonably be mistaken for an exit: storage rooms along exit corridors, mechanical or electrical rooms near exits, basement stairways that don't lead outside, restrooms on egress paths, and elevator lobbies (elevators are not exits). Labeling the door with its actual use — 'STORAGE,' 'ELECTRICAL ROOM,' 'RESTROOM' — is equally compliant and often more informative.
How high should an exit sign be mounted?
OSHA 1910.37(b)(7) specifies the minimum EXIT letter dimensions (6-inch letters, 3/4-inch strokes) — it does not set a universal mounting height for every building. Mounting-height requirements typically come from the adopted building and fire codes (such as IBC or NFPA 101) and the local authority having jurisdiction, so verify with your local fire marshal or AHJ.
How far away must an exit sign be visible?
OSHA requires the line of sight to an exit sign to remain clearly visible at all times along the exit route (1910.37(b)(4)), with signs unobstructed by decorations or equipment. Separately, NFPA 101 rates listed exit signs for a viewing distance (commonly 100 feet or the sign's listed rating) — a spacing benchmark many jurisdictions enforce through their adopted fire code.
Can an exit sign have directional arrows?
Yes. Where the direction of travel to the nearest exit is not immediately apparent, OSHA requires a sign indicating the direction of travel — in practice, an EXIT sign with a directional arrow (or chevron) pointing along the route. The arrow must accurately show the direction of travel toward the exit.
Does every door need an exit sign?
No. Exits must be marked 'EXIT,' and doors that could be mistaken for exits must be marked 'Not an Exit' or by their actual use. Ordinary doors that could not be confused with an exit do not require signage under 1910.37(b). Directional signs are only required where the way to the exit isn't obvious.
How many exits does OSHA require?
Under 29 CFR 1910.36(b), a workplace must normally have at least two exit routes located as far apart as practical, so employees can evacuate if one route is blocked. More exit routes are required where occupancy or workplace arrangement demands it, and a single route can be permitted only where all employees can evacuate safely through it.
Does OSHA require emergency lighting for exit signs?
OSHA requires each exit route to be adequately lighted (1910.37(b)(1)) and each exit sign to be illuminated (1910.37(b)(6)). The widely cited 90-minute battery-backup requirement comes from NFPA 101 Life Safety Code emergency lighting provisions, which most jurisdictions enforce through their adopted fire code — keep the OSHA and NFPA requirements distinct when auditing.
What is OSHA 1910.37?
29 CFR 1910.37 is the OSHA standard covering maintenance, safeguards, and operational features for exit routes. Its subsection (b) contains the lighting and marking rules: exit-route lighting, 'EXIT' marking, unobstructed door visibility, directional signs, 'Not an Exit' marking, sign illumination, and EXIT letter dimensions.
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