Exit signs: why "one per door" fails the wayfinding test

The gap between compliant and usable

A building can pass inspection with one sign per exit door and still leave people walking the wrong way down a corridor, because the sign is not visible until they are already at the door. In smoke, the effective viewing distance drops sharply, and a sign that depends on being close is not doing its job.

What actually decides visibility

• Sight line: the sign must be visible from the length of the route, not only from the final approach. Racking, columns and ceiling changes all break it.
• Viewing distance: sign size has to match the distance from which it must be read — a small sign at the far end of a long corridor is decorative.
• Mounting height: too high and it is above the smoke layer or outside the field of view; too low and it is blocked by people and equipment.
• Consistency: a route that is marked in three different styles reads as three different routes.

Configuration approach

• Place signs so each is visible from the previous one, forming a continuous chain along the route.
• Repeat the sign after every change of direction, and at every decision point where a person could turn wrongly.
• Use maintained signs where the space is occupied during an outage, and non-maintained where the route is otherwise lit.
• Check the IP and IK ratings for the actual environment, not for a generic interior.

The maintenance question

Signs fail for the same reason luminaires do: an ageing battery, water ingress, or testing that never happened. Where signs are mounted high or in inaccessible positions, self-testing units turn an invisible failure into a reported one.

Before you order

• The floor plan, with racking or furniture that interrupts sight lines.
• The longest viewing distance on each route.
• The required duration and sign format from the local authority.
• Whether the interior is washed down, dusty, or subject to vehicle traffic.

Anshine manufactures exit and escape sign luminaires alongside emergency drivers and LiFePO4 packs, from 3W to 300W, with CE, RoHS, CB and ISO 9001 documentation.