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1011.7.3 Other Vertical Shafts
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Interior vertical shafts other than stairways, including but not limited to elevator hoistways and service and utility shafts, shall be enclosed as required by the International Building Code where there is a change of use to a higher-hazard category as specified in Table 1011.4.
Exceptions:
- Existing 1-hour interior shaft enclosures shall be accepted where a higher rating is required.
- Vertical openings, other than stairways, in buildings of other than Group I occupancy and connecting less than six stories shall not be required to be enclosed if the entire building is provided with an approved automatic sprinkler system.