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Every Type 1 stage shall be provided with a means of natural ventilation so arranged and equipped as to function in case of fire. Such means of ventilation shall consist of not less than one vent nor more than three vents to the outer air meeting the requirements of this section.
(a) Location. The stage openings to stage vents shall be located in the soffit of the ceiling of the stage at points which will effectively ventilate the stage area in the event of fire.
(b) Area. The aggregate area of the stage openings of all stage vents shall be not less than five percent of the floor area of the stage.
(c) Shafts and Vent Openings.
(1) Each stage opening shall be connected by a shaft to vent openings located not less than 15 feet above any roof which is within a horizontal distance of ten feet from any vent opening.
(2) The angle between the axis of the shaft and the vertical shall not exceed 30 degrees.
(3) The cross-sectional area of any shaft and the clear area of any vent opening shall be not less than the area of the stage opening served.
(4) Vent openings shall not be located within ten feet of a lot line nor within 20 feet of any door, window or wall opening on the same lot.
(d) Enclosure of Shafts. All shafts shall be enclosed with construction providing fire resistance of not less than two hours; except that shafts passing through any portion of a building outside the stage block shall be enclosed with construction providing fire resistance of not less than three hours.
(e) Dampers. All stage vents shall also be equipped with damper controls as required by Chapter 18-28.
(f) Tests. Upon completion of the installation, every stage vent and all operating mechanisms and appurtenances shall pass a test conducted by the department of buildings. The test shall demonstrate that each of the devices for operation and control, required under this section, are properly operative.
(Prior code § 54-6.4; Amend Coun. J. 9-13-89, p. 4604; Amend Coun. J. 11-9-16, p. 36266, § 18; Amend Coun. J. 9-6-17, p. 55278, Art. II, § 28)