OSHA’s exit sign requirements sit in 29 CFR 1910.37: every exit door in a general industry workplace must be marked with a sign reading “Exit” in plainly legible letters at least six inches tall, with principal strokes at least three-fourths of an inch wide, in a distinctive color, lit by a reliable light source to at least five foot-candles on the sign face.1eCFR. 29 CFR 1910.37 – Maintenance, Safeguards, and Operational Features for Exit Routes The sign has to stay clearly visible from anywhere along the escape path, and any door that could be mistaken for an exit needs its own sign saying it isn’t one.
Letter Size, Stroke Width, and Color
The word “Exit” must appear in letters at least six inches tall. The principal strokes of each letter must be at least three-fourths of an inch wide.1eCFR. 29 CFR 1910.37 – Maintenance, Safeguards, and Operational Features for Exit Routes OSHA does not mandate a specific color, but the regulation calls for the sign to be “distinctive in color,” which in practice means the lettering has to contrast sharply against the background. Red letters on a white background and white letters on a green background are the two combinations you’ll see most often in compliant facilities, and both satisfy the contrast test.
The rule doesn’t say anything about typeface, but “plainly legible” governs. A stylized or condensed font that shrinks the visual weight of the strokes below the three-quarter-inch minimum will fail even if the letters technically measure six inches tall.
Illumination
An exit sign that goes dark during a power failure is essentially invisible, so OSHA requires every exit sign to be lit by a reliable light source. Externally illuminated signs must reach at least five foot-candles (54 lux) on the sign face. Self-luminous and electroluminescent signs are permitted as an alternative, provided they maintain a minimum luminance of 0.06 footlamberts (0.21 cd/m²).1eCFR. 29 CFR 1910.37 – Maintenance, Safeguards, and Operational Features for Exit Routes
The exit route itself must also be “adequately lighted so that an employee with normal vision can see along the exit route.”1eCFR. 29 CFR 1910.37 – Maintenance, Safeguards, and Operational Features for Exit Routes There’s no lux number attached to the path, but dim hallways and unlit stairwells give an inspector everything needed to cite you under that clause.
Placement and Visibility
OSHA does not prescribe a mounting height. The standard takes a performance-based approach: the line of sight to an exit sign must be clearly visible at all times. Decorations, stacked inventory, banners, hanging equipment, or anything else that blocks an employee’s view of the sign creates a violation. Exit route doors also cannot have decorations or signs that obscure their visibility.1eCFR. 29 CFR 1910.37 – Maintenance, Safeguards, and Operational Features for Exit Routes
Where the direction of travel to the nearest exit isn’t immediately obvious, additional signs must be posted along the exit access showing which way to go.1eCFR. 29 CFR 1910.37 – Maintenance, Safeguards, and Operational Features for Exit Routes These directional signs typically use an arrow. Federal OSHA sets no maximum distance between signs, but long stretches without a visible sign will draw a citation under the “clearly visible at all times” language.
Exit signs also lose their effectiveness when surrounded by competing visual noise. The distinctive-color requirement addresses part of that, but grouping exit signs with promotional posters, safety slogans, or unrelated directional graphics dilutes the signal employees need to pick up instantly during a smoke-filled evacuation.
“Not an Exit” Signs
Any door or passageway along the exit access that someone might reasonably mistake for an exit must be marked “Not an Exit” or labeled with a sign describing its actual use, such as “Closet” or “Storage.”1eCFR. 29 CFR 1910.37 – Maintenance, Safeguards, and Operational Features for Exit Routes This is one of the most commonly overlooked requirements. A door that sits along a corridor people use as an exit route and looks like it might lead outside needs a sign clarifying that it doesn’t.
Keeping the Sign Visible Day to Day
Compliance isn’t a one-time installation. No materials or equipment may be placed within the exit route, permanently or temporarily.1eCFR. 29 CFR 1910.37 – Maintenance, Safeguards, and Operational Features for Exit Routes Boxes stacked in a hallway, equipment parked in front of a fire door, or pallets leaning against an exit wall are all citable. This is where inspectors find violations most often, because keeping routes and signs visible requires daily attention, not a single install-and-forget project.
ADA Tactile and Braille Signs at Exits
OSHA’s sign rules cover visual legibility. The ADA Standards for Accessible Design add a separate layer for people who are blind or have low vision, and employers routinely miss it because they assume the illuminated overhead sign is enough. Under ADA Section 216.4, tactile signs must be provided at doors to exit stairways, exit passageways, and exit discharge points.2U.S. Access Board. Guide to the ADA Accessibility Standards – Chapter 7: Signs These wall-mounted tactile signs supplement the OSHA-required overhead signs; they don’t replace them.
The specifications under ADA Section 703 are precise. Raised characters must sit at least 1/32 inch above the background, be uppercase, and use a sans-serif font, with character height between 5/8 inch and 2 inches. Grade 2 contracted Braille with domed or rounded dots sits directly below the corresponding raised text.3U.S. Access Board. Chapter 7: Communication Elements and Features The baseline of the lowest tactile character must be at least 48 inches above the floor, and the baseline of the highest character no more than 60 inches above the floor.2U.S. Access Board. Guide to the ADA Accessibility Standards – Chapter 7: Signs The sign goes on the latch side of the door so a person reading the Braille isn’t struck when the door swings open.
Where These Rules Apply
Sections 1910.34 through 1910.39 cover all general industry workplaces except mobile workplaces such as vehicles and vessels.4eCFR. 29 CFR Part 1910 Subpart E – Exit Routes and Emergency Planning That takes in offices, warehouses, retail stores, and manufacturing plants. Construction sites and shipyards fall under separate OSHA subparts with their own exit and signage rules. If your state runs its own OSHA-approved plan, the state standards must be at least as protective as the federal ones, and some layer on additional requirements.
Penalties for Exit Sign Violations
Exit sign problems are among OSHA’s most frequently cited violations, and the fines are not small. As of the most recent published adjustment, the penalty ceilings are:
- Serious or other-than-serious violation: up to $16,550 per violation.5Occupational Safety and Health Administration. OSHA Penalties
- Willful or repeated violation: up to $165,514 per violation.5Occupational Safety and Health Administration. OSHA Penalties
- Failure to abate: up to $16,550 per day beyond the abatement deadline.5Occupational Safety and Health Administration. OSHA Penalties
These amounts adjust upward each January for inflation. Each missing or noncompliant sign counts as its own violation, so a facility with several unmarked exits and a handful of blocked corridors can stack citations quickly. Willful violations, where the employer knew about the hazard and chose not to fix it, carry penalties roughly ten times higher than serious ones. The failure-to-abate penalty accrues daily, which creates real urgency to correct anything an inspector flags.