OSHA Emergency Exit Route Requirements for Warehouses: Number, Width, and Marking

October 2024, peak season just kicking off. Night shift. 1:40 in the morning, and the smoke alarm starts screaming — and one of our emergency exit routes was blocked solid.

A battery in the charging area had overheated and started smoking — not a drill. Twenty-eight people on the floor. On the monitor, exactly one reaction: everybody ran for the west door.

We had two exits, east and west. But the east one was walled off by forty-odd pallets stacked "just for one night" — three days earlier. The smoke turned out to be nothing. I stood at the west door counting heads three times, hands shaking.

Let me be straight with you: in warehousing, we talk throughput, KPIs, pick paths all day. Nobody wants to talk about emergency exits — on a normal day, they don't make a dime. But on the day you need one, OSHA emergency exit route requirements are the only thing that matters.

How We Found Out the Hard Way: The Insurance Guy Panicked First

Three days later, our insurer's risk assessor came for his annual walkthrough. Forty minutes, two pages of notes — five of them about exit routes:

1. The east exit route was blocked by pallets — not "readily accessible" at all times;
2. The office fire door was locked, key in an admin drawer;
3. No directional sign at the mezzanine stairwell;
4. Three EXIT boxes dead, a fourth hidden behind new racking;
5. A storage room door that looked exactly like an exit had no "Not an Exit" marking.

My first thought: our renewal premium is about to jump. Two weeks of fixes — fourteen light boxes, nine arrows, repainted lines. That's when I finally read 29 CFR 1910.36 and 1910.37. The text isn't long, but every line was paid for in accidents. What follows is the federal baseline — always check OSHA's official site for the current text; some State Plans are stricter.

The Number Rule: At Least Two Exit Routes, Kept Far Apart

1910.36(b) is one sentence at its core: a workplace must normally have at least two independent exit routes, as remote from each other as possible. If fire or smoke seals one, the other still gets you out.

One exception exists: a small building, few people, simple layout, where you can demonstrate everyone evacuates safely on a single route. Brothers — that word "demonstrate." Ninety-nine percent of warehouses can't. A 200-person DC? Build two or more.

What we do now: beyond east and west, one emergency door each in receiving and shipping — four total. Locked against theft from outside, but from the inside they must open at any time: no key, no special move, no lock (1910.36(d)). Panic-bar crash locks: dead outside, one push inside. Don't cheap out on this.

One most people miss: any room designed for more than 50 people must have its exit-route door swing outward, in the direction of travel, on side hinges (1910.36(e)). Our upstairs training room used to swing inward — replaced in the same fix-up.

Width and Height: 28 Inches Is the Floor, Not the Target

1910.36(g) gives three hard numbers:

• Exit access width: no less than 28 inches (about 71 cm) at any point. Ten feet wide overall doesn't save you if one column pinches it to 24 inches — that's a violation.
• Ceiling height: at least 7 feet 6 inches (about 2.3 m); any projection from the ceiling — pipes, cable trays — must stay at least 6 feet 8 inches (about 2 m) above the floor.
• Width must never decrease in the direction of travel. It should get wider toward the exit, or at minimum stay the same.

Let me be straight: 28 inches is OSHA's legal floor, not a usable target. Seventy-one centimeters — a grown man squeezes through sideways, but with a backpack on, or half-carrying an injured coworker? Two abreast, forget it. Twenty-eight people through a 28-inch pinch versus a ten-foot aisle — the speed difference is several times over.

Our rule now: exit routes are built to main pick-aisle standard, ten feet wide minimum. Compliance takes care of itself — and nobody dares block it, because blocking it kills picking.

Marking Requirements: Lights, Signs, Arrows — Nothing Optional

1910.37 covers maintenance and marking. Six core requirements:

1. Every exit must carry a clearly visible "EXIT" sign, letters at least 6 inches (about 15 cm) high, principal strokes at least 3/4 inch (about 1.9 cm) wide;
2. Signs must be lit by a reliable light source — and stay lit when the power dies. Emergency lights or battery boxes are fine, but you have to test them on a schedule;
3. Where the direction of travel isn't obvious, directional arrows are mandatory, guiding people along the route all the way to the exit;
4. Doors that look like exits but aren't — storage rooms, electrical closets — must be marked "Not an Exit" or labeled with their real use;
5. The whole route must be lit well enough that a person with normal vision can see the walking surface;
6. No decorations, no ads, nothing that blocks the view of an exit door or sign.

We learned this the hard way: we once mounted an EXIT box five meters up on a crossbeam. Looked great — until you remember smoke rises. In a real fire, a sign at sixteen feet is the first thing that disappears. Now everything is dual-height: one box over the door, one arrow a meter off the floor. In heavy smoke people move bent over. The low sign is the one that saves lives.

Three Detours We Took Getting Our Exit Routes Compliant

Painted lines, no enforcement. We started with yellow floor lines and called it done. Then peak season hit, slots overflowed, and "borrowing" the aisle became an open secret. Now there's a row of bollards and chain inside the lines. Want to stage there? Take down the chain — which needs the shift lead's signature. Nobody wants to sign that.

Inspections by "whoever's free." First it was the safety guy's side job, once a month — and side job means nobody's job. Now it's fixed: every Monday, first shift, fifteen minutes, exit-route walk. The checklist below hangs by the exit door. The shift lead walks it and signs. Problems get fixed that day or escalated.

New-hire training by slideshow. Safety used to be a PowerPoint chapter. Now: on day one, a veteran walks the new hire through the actual escape route — workstation to nearest exit to assembly point, timed. Then the new hire walks it back and narrates it. All 200-plus of us have done it — muscle memory beats slides in a real emergency.

Our Fixed Routine: One Self-Check Sheet

This sheet lives on our safety lead's desk, used every Monday. Steal it:

A Contrarian Take

A lot of people think: OSHA checks "do you have it," so having it is enough. Wrong. OSHA's text is the floor — the legal minimum for not getting cited, not the engineering standard for getting out alive. A 28-inch route is legal, but running 200 people through it at night makes crowd-crush a bigger risk than the fire. An EXIT sign at sixteen feet is legal, but in smoke it might as well not exist.

And the money: our two-week fix — a dozen light boxes, some arrows, a few doors — spread over 200 heads cost less than one lunch per person. One citation, one small fire, one denied claim — each costs dozens of times that. Everybody in this business can do that math.

A Reminder for Fellow Operators on Exit Routes

Before peak season, take ten minutes and walk to the exit farthest from your desk: does the door push open? Are the lights on? Any pallet sitting there "just for one night"?

Don't wait for the alarm before you look.

By Chen Feng, Warehouse Operations Manager