909.20 Smokeproof enclosures.
BC § 909.20
Where required by Section 1023.11, a smoke proof enclosure shall be constructed in accordance with this section. Where access to the roof is required by the New York City Fire Code, such access shall be from the smoke proof enclosure where a smoke proof enclosure is required. Smokeproof enclosures shall consist of one of the following systems: 1. An enclosed interior exit stairway constructed in accordance with Section 1023 and accessed through an open exterior balcony.
2.An enclosed interior exit stairway constructed in accordance with Section 1023 and accessed through a naturally ventilated vestibule.
3.An enclosed interior exit stairway constructed in accordance with Section 1023 and accessed through a mechanically ventilated vestibule.
4.A pressurized interior exit stairway constructed in accordance with Section 1023.
