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[BG] ATRIUM. A vertical space that is closed at the top, connecting two or more stories in Group I-2 and I-3 occupancies or three or more stories in all other occupancies.
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Related Code Sections

1017.3.2 Means of Egress, Atriums
Exit access travel distance for areas open to an atrium shall comply with the requirements of Sections 1017.3.2.1 through 1017.3.2.3 ...
Section 404 Special Detailed Requirements Based on Occupancy and Use, Atriums
The provisions of Sections 404.1 through 404.11 shall apply to buildings containing atriums. Atriums are not permitted in buildings ...