Occupiable Story 2 : A story occupied by people on a regular basis. Stories used exclusively for mechanical equipment rooms, elevator penthouses, and similar spaces are not occupiable stories
NFPA 101B Code for Means of Egress for Buildings and Structures, 2002 ed. https://law.resource.org/pub/us/code/ibr/nfpa.101. 2003.pdf, (Code: Means of Egress for Build and Struc - Amer) {246 NFC}