Russ:
Ron said most or all of it above.
Basically, the "approved" egress path must have exit signs (w/back-up illumination) and emergency lighting. That is usually what is required. That is usually why there is not a required exit unit in every office room of a office building.
Thanks to Ron for the above text, I have to copy it.
(edited)
Food for thought: some jurisdictions (California) are requiring a "master/slave" exit unit. THe master being over the door, and the slave being mounted close to the floor. This provides directional guidance in a smoke condition. There also is a illuminated "guide rail" set-up, like a glow stick thing (may be fiber optic) that is mounted low to guide you as you are crawling.
John
[This message has been edited by HotLine1 (edited 04-29-2003).]
