You are viewing an archived code
(a) “Atrium” means an opening connecting two or more stories, other than enclosed stairways, elevators, hoistways, escalators, plumbing, electrical, air- conditioning, or other equipment shafts which are closed at the top. Stories do not include balconies within assembly occupancies or mezzanines complying with Section 13-48-020(d)(2).
(b) Any new building containing an atrium shall comply with all the requirements of this chapter.
(c) Atriums are permitted in buildings of Type I construction.
(d) Atriums shall be provided with a smoke control system meeting the following requirements:
(1) If the volume of the atrium does not exceed 600,000 cubic feet, the exhaust system shall provide not less than 6 air changes per hour.
(2) If the volume of the atrium exceeds 600,000 cubic feet, the exhaust system shall provide not less than 4 air changes per hour.
(3) Supply openings shall be sized for at least one-half the exhaust capacity.
(4) Exhaust shall be at the top of the atrium and intake at the bottom.
(5) Smoke detectors shall be provided at the ceiling of the atrium and at the perimeter of the atrium on each floor within 15 feet.
(6) The smoke control system shall have completely automatic control. The automatic-control sequences shall be initiated from the activation of a sprinkler system, smoke detectors in the atrium area, or manual control at the fire command panel.
(e) Plans shall indicate the total area and total volume open to the atrium, and shall specify the dimensions, capacity, and direction of flow for all supply and exhaust openings.
(Added Coun. J. 9-6-17, p. 55278, Art. VII, § 10)