A practical, non‑salesy guide to choosing single‑ or double‑face edge‑lit EXIT signs using sightlines, approach angles, and mounting orientation—plus arrow placement and AHJ checkpoints.
Last updated: October 2025
Why Face Count Matters
Face count determines how many directions a legend can be read from. Single‑face signs show one legend (ideal for wall locations with one‑way travel). Double‑face signs show two opposing legends (best for open spaces or corridors with traffic from both directions). For a broad overview of families and options, start with the Edge‑Lit Exit Signs — Buyers Guide.
Corridor Sightlines & Approach Angles
Plan sign locations so occupants see the legend at natural approach angles. Long, straight corridors often favor ceiling‑mounted units placed on the centerline; perpendicular approaches (T‑intersections, lobby entries) benefit from end/flag mounts that project into view.
- Height: follow manufacturer label and local code; keep the legend clear of obstructions.
- Distance: place signs so a traveler sees at least one legend at decision points.
- Glare: avoid positions that wash the legend under strong downlights or daylight glare.
Quick Rules & Decision Table
| Condition | Choose Single‑Face if… | Choose Double‑Face if… |
|---|---|---|
| Wall‑bound travel | Traffic flows one direction along a wall, with the sign mounted flat. | — |
| Two‑way approach | — | Occupants approach from two sides (corridors, open lobbies, T‑intersections). |
| Long corridor | One‑way travel or dead‑end with a single approach. | Centerline runs with two‑way travel or multiple approach angles. |
| Egress turns | Single direction with one decisive turn. | Multiple decision points where a second legend improves coverage. |
| Aesthetic constraints | Minimal projection desired at a wall. | Projection is acceptable to deliver sightlines from both directions. |
Mounting Orientation & Face Count
Ceiling mounts place the legend on a corridor centerline (great for two‑way travel, often paired with double‑face). End/flag mounts project the legend perpendicular to a wall for high visibility at intersections (commonly double‑face). Wall/back mounts keep a low profile on a wall (commonly single‑face). For step‑by‑step mounting basics and wiring, see the Edge‑Lit Exit Sign Mounting & Wiring Guide.
Layout Scenarios (Corridors, Lobbies, Intersections)
- Straight corridor: ceiling‑mounted double‑face units on the centerline improve read from both directions.
- T‑intersection: end/flag double‑face visible to both approach legs.
- Lobby/open area: double‑face near decision points; verify that projections don’t conflict with finishes.
- Wall‑mounted runs: single‑face at one‑way segments or dead‑ends where the approach is from a single direction.
- Recessed trims: when the design demands minimal projection, use recessed kits—coordinate access to the test switch/indicator. See Recessed Edge‑Lit — Ceiling Trim & 8″ Letters for details.
Arrow (Chevron) Application
Apply chevrons only after verifying the final egress path and door swing on site. For double‑face units, ensure both legends point correctly; some families allow field conversion and panel flipping—level the panel before applying arrows.
- Mockup first: dry‑fit the panel, stand in the approach path, and confirm the arrow direction with the GC.
- Documentation: add arrow directions to submittals to avoid change orders.
Spec Checklist & AHJ Notes
- Listing: UL 924 emergency lighting.
- Letter height: 6″ typical; some jurisdictions/occupancies require 8″—confirm with your AHJ.
- Faces: specify single vs double based on approach directions.
- Mounting: ceiling, end/flag, or wall/back; coordinate projection with finishes and clearances.
- Battery & testing: 90‑minute backup; plan monthly/annual checks and logging.
- Color: red or green per campus or AHJ standard—match existing where applicable.
AHJ checklist: face count, mounting orientation, letter height (6″ vs 8″), legend color, and any local amendments. Confirm before ordering and document your test plan.
Common Mistakes & Fixes
- Under‑signing bidirectional paths: upgrade to double‑face where two‑way approach exists.
- Wrong arrow direction: confirm door swing and egress in the field before applying chevrons.
- Poor leveling: square the canopy and trim before final tighten; re‑check after the ceiling closes.
- Blocked test access: keep the status LED/push‑to‑test visible; use remote test switch where allowed.
- Mismatched finishes: align housing color and panel type with adjacent fixtures/finishes.
Color visibility questions? See Red vs Green Letters for Edge‑Lit Exit Signs. If you’re still deciding among sign families, compare options here: Edge‑Lit vs Photoluminescent vs Thermoplastic.
FAQ
Is double‑face always required in corridors?
No. Use double‑face when traffic approaches from two directions. Single‑face is fine for one‑direction travel or wall‑bound runs.
Does ceiling mounting mean I must use double‑face?
Often, yes, for two‑way corridors. But if the approach is one‑directional, single‑face can still be appropriate—confirm sightlines.
Can I convert a single‑face to double‑face later?
Many families support field conversion with an extra panel/hardware kit. Verify compatibility in the submittal before rough‑in.
Do recessed trims limit face options?
Most families offer recessed trims for both face counts. Coordinate access to indicators and the push‑to‑test after finishes.