In a recent Q&A on the FacilityCare website, consultant Brad Keyes answered a question about emergency illumination in mechanical rooms.
Q: Is emergency lighting required for mechanical rooms?.
A: The answer depends on whether the mechanical room has a designated aisle, the occupancy classification of the building and whether it is an underground or windowless structure. According to section 7.8 of the 2000 Life Safety Code, the means of egress is required to be illuminated in the following locations in any occupancy:
• Designated stairs
• Designated aisles
• Designated corridors
• Designated ramps
• Passageways leading to an exit
As far as a mechanical room is concerned, if the room is large enough that there would be a designated aisle in the room, then it would require illumination.
Designing for Distraction: Benefits for Children, Families
Staffing and Consolidation Reshape Outpatient Facility Strategies
Adams Health Network Falls Victim to Phishing Attack
Ventilation and Filtering for Infection Control 
ChristianaCare Opens Aston Campus Neighborhood Hospital