Keep egress visible when the power fails—without guessing on specs
Exit signs and emergency lighting are small line items that carry outsized risk. When a project engineer, MRO manager, or procurement team is sourcing across multiple sites (Boise, Salt Lake City, Denver, Phoenix, Seattle—or nationwide), the goal is consistent: select code-aligned, durable equipment that inspectors recognize and maintenance teams can test and document. This guide explains what to verify when buying exit signs & emergency lighting in the United States, how to plan testing, and how to avoid common mismatches between “what was ordered” and “what the building needs.”
What exit signs & emergency lighting are supposed to do (in plain terms)
During a utility outage or an emergency electrical event, occupants still need a clearly marked and lighted path to safety. Most U.S. codes and standards approach this with two complementary layers:
1) Exit signage
Signs identify exits and, where needed, direct occupants to the exit access. OSHA requires exit signs to be plainly legible with specific minimum letter sizing (commonly referenced as 6-inch letters with 3/4-inch stroke). Those same sizing concepts also appear in building code language. (osha.prod.pace.dol.gov)
2) Emergency illumination
Emergency lighting supports safe travel on the egress route when normal lighting is lost. The IBC sets performance concepts and includes illumination allowances at the end of the required emergency duration (light levels can decline as batteries discharge). (codes.iccsafe.org)
Key standards and “what they mean” for buyers
Facilities often reference OSHA, the International Building Code (IBC), and life safety codes enforced by the local AHJ (Authority Having Jurisdiction). On the product side, a major checkpoint is whether the equipment is listed to the appropriate safety standard.
| Reference | Why it matters | What to verify in purchasing |
|---|---|---|
| OSHA 29 CFR 1910.37 | Workplace exit route marking and visibility expectations (including exit sign legibility requirements). | Sign legibility, placement needs, and that doors/signs aren’t obscured by décor or storage. |
| IBC Chapter 10 (Means of Egress) | Building code criteria for exit signs and egress illumination, including letter sizing concepts and allowable illumination decline by the end of the emergency duration. | Exit sign format, directional signage where required, and that emergency lighting performance aligns with the project’s code basis. |
| UL 924 | Product safety standard for emergency lighting and power equipment (including exit signs). UL notes UL 924’s role supporting code compliance pathways. | Look for “UL 924 listed” (or equivalent NRTL listing) for exit signs / emergency lighting components and compatible power equipment. |
Note: Many projects also reference NFPA pathways (for example, emergency lighting test routines widely used in facilities programs). UL describes how UL 924 certifications connect to NFPA and international codes in practice. (ul.com)
Specification checklist: what to decide before you order
1) Power/backup strategy: battery unit vs. central/inverter vs. generator-supported
Some sites prefer self-contained battery units (fast to deploy, straightforward replacements). Others standardize on central power/inverters for testability and maintenance. Your best option depends on site size, maintenance staffing, uptime targets, and how your AHJ wants testing documented.
2) Exit sign type: internally illuminated, photoluminescent, or self-luminous
Internally illuminated signs are the default in many commercial environments. Photoluminescent and self-luminous options can be appropriate in specific applications, but buyers should confirm how they are listed and how they will be charged/maintained and inspected. UL 924 explicitly addresses emergency lighting and power equipment and also covers photoluminescent/self-luminous exit sign considerations. (shopulstandards.com)
3) Mounting and directional indicators
Wall, ceiling, or end mounting drives the canopy and wiring needs. Directional chevrons matter on corridors, cross-corridors, and areas where the exit isn’t obvious. This is a classic purchasing pitfall: buying the “standard sign” and then discovering the field condition needs a different mounting kit or a double-face configuration.
4) Environmental conditions (especially in industrial and outdoor-adjacent spaces)
Warehouses, process areas, loading bays, cold rooms, and wet locations can shorten battery life and haze optics. Confirm temperature ratings, gasketed housings where needed, and lens durability. For industrial buyers, matching fixture ratings to the space classification and physical abuse risk reduces repeat replacements.
5) Documentation needs: submittals, cut sheets, and “inspection-friendly” labeling
Multi-site teams benefit from standardizing on a short list of approved models. Ask for consistent cut sheets, clear listing marks, and predictable replacement batteries/heads. This is also where export-ready procurement shines: aligned part numbers, harmonized packing lists, and consolidated documentation reduce friction for projects outside the U.S.
Testing & maintenance: build it into your buying decision
A large share of “emergency lighting problems” are really maintenance program problems: dead batteries, failed drivers, blocked visibility, or missing documentation. Many facility programs follow a cadence consistent with life safety expectations: a monthly functional test and an annual full-duration test (commonly referenced as 30 seconds monthly and 90 minutes annually for battery-powered emergency lighting used for egress). (jointcommission.org)
How-to: a simple, repeatable field checklist
Step 1: Confirm the exit sign is visible from the approach and not obscured by banners, stored materials, or decorations (OSHA also addresses not obscuring exit route doors/signage). (osha.prod.pace.dol.gov)
Step 2: Use the test button (or control system test) and verify lamp/LED operation, including both faces and any directional indicators.
Step 3: Walk the egress path during test: confirm critical turns, stairs, and discharge points have usable light (not just “a glowing fixture somewhere”).
Step 4: Document the result by location and asset ID. Note battery replacement dates and any failures immediately.
Step 5: After repairs, re-test. A quick “it lights up” check is not the same as verifying it will perform under load.
Did you know? Quick facts that prevent re-orders
• OSHA specifies minimum exit sign letter sizing (commonly referenced as 6-inch letters with 3/4-inch stroke). (osha.prod.pace.dol.gov)
• The IBC includes criteria for egress illumination performance and allows end-of-duration light levels to decline to defined minimums. (codes.iccsafe.org)
• UL 924 is the primary U.S. product safety standard used for emergency lighting and power equipment, including exit signage. (shopulstandards.com)
Local angle: sourcing across U.S. cities without creating “site-by-site” chaos
In the United States, adoption and enforcement can vary by jurisdiction even when everyone is referencing similar code families. A practical approach for multi-site procurement is to standardize what you can, and leave room for local exceptions:
Standardize: your preferred exit sign housing, battery type, mounting kits, and a short list of approved SKUs that are listed to the right product standard.
Localize: directional chevrons, specialty signage, and any AHJ preferences on placement, photometrics, or documentation.
Plan logistics: if you’re shipping project material between Boise and other hubs (Salt Lake City, Denver, Phoenix, Seattle), align lead times on batteries/heads so maintenance doesn’t get stuck with “orphan” models.
Talk to IFW Supply about exit signs & emergency lighting
If you need help selecting compliance-ready exit signs, emergency lighting units, batteries, or supporting safety products—especially for multi-site rollouts or export-ready procurement—IFW Supply can assist with product cross-referencing, submittal support, and logistics planning.
FAQ: Exit signs & emergency lighting
Do exit signs need to be illuminated?
Many applications use internally illuminated exit signage or other listed approaches. The right answer depends on the building’s adopted code, the space, and the AHJ. From a purchasing perspective, verifying the sign’s listing (commonly UL 924) and suitability for the installation environment is a strong baseline. (shopulstandards.com)
What’s the common testing cadence for battery-powered emergency lighting?
Many facility programs follow a monthly functional test and an annual full-duration test (often referenced as 30 seconds monthly and 90 minutes annually for battery-powered egress lighting). Always align with your AHJ and organizational policy. (jointcommission.org)
What does “UL 924 listed” mean for an exit sign or emergency light?
UL 924 is a U.S. safety standard covering emergency lighting and power equipment (including exit signs). A listing indicates the product has been evaluated to the standard’s requirements for that category, which can help streamline acceptance with inspectors when the installation is also code-compliant. (shopulstandards.com)
Are there minimum size requirements for the word “EXIT”?
OSHA’s exit route rules specify that each exit sign must have the word “Exit” in plainly legible letters with minimum dimensions (commonly referenced as 6-inch letter height and 3/4-inch stroke width). Building codes also include exit sign visibility/character requirements. (osha.prod.pace.dol.gov)
What information should procurement include on a purchase order?
Include mounting type (wall/ceiling/end), face count (single/double), directional indicators, voltage, battery type/chemistry, environmental rating (temperature/wet location), and listing requirements (commonly UL 924). Standardizing these fields reduces site-to-site variance and lowers change orders.
Glossary (quick definitions)
AHJ (Authority Having Jurisdiction)
The local official or agency that interprets and enforces the applicable codes for a facility (fire marshal, building department, etc.).
Means of egress
The continuous path occupants take to exit a building safely, typically defined and regulated by building and fire codes. (codes.iccsafe.org)
NRTL (Nationally Recognized Testing Laboratory)
A testing organization recognized for evaluating products to safety standards; buyers often use “listed” products to streamline inspection acceptance.
UL 924
A safety standard covering emergency lighting and power equipment (including exit signage) used in many compliance pathways. (shopulstandards.com)