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Incidental use areas in Groups A, B, E, F, H, M, and S occupancies need not be separated when the incidental use area is protected with automatic sprinklers.
1106.3.2.1 Groups I and R Occupancies
Incidental use areas in Groups I and R occupancies need not be separated when the incidental use area is protected with automatic sprinklers and the construction of such areas is capable of resisting the passage of smoke. Doors to such areas shall be a minimum of one-hour fire-rated, solid-core wood doors or insulated steel doors. Doors shall be self-closing or automatic-closing by smoke detection.

Related Code Sections

903.1.1 Fire Protection Systems, Alternative Protection
Alternative automatic fire-extinguishing systems complying with Section 904.shall be permitted in lieu of automatic sprinkler protection where ...