The provisions of Section 909 of IBC are not adopted. The following language is adopted as Section 909:
"909. SMOKE CONTROL SYSTEMS
909.1 Smoke control for atriums.
Where required by Section 404.5, 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 (16 990 m
3), 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 (16 990 m
3), 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 (4572 mm).
6. The smoke control system shall have completely automatic control. The automatic-control sequences shall be initiated by activation of either the automatic sprinkler system or smoke detectors in the atrium area.
909.2 Acceptance.
Buildings, or portions thereof, required by this code to comply with this section shall not be issued a certificate of occupancy until such time that the fire code official determines that the provisions of this section have been fully complied with and that the fire department has received satisfactory instruction on the operation, both automatic and manual, of the system and a written maintenance program complying with the requirements of the Chicago Fire Prevention Code has been submitted to and accepted by the fire code official.
Exception: Where phased construction is permitted, a temporary certificate of occupancy shall be allowed provided that those portions of the building to be occupied meet the requirements of this section and that the remainder does not pose a significant hazard to the safety of the proposed occupants or adjacent buildings.
909.3 Optional smoke control systems.
Optional smoke control systems shall comply with Appendix S."
(Amend Coun. J. 2-19-20, p. 14473, Art. II, § 34; Amend Coun. J. 10-7-20, p. 21791, Art. II, § 18)