Shafts that do not extend to the top of the building or structure shall:
1. Be enclosed at the highest level with construction of the same fire-resistance rating as the highest floor through which the shaft passes, but not less than the rating required for the shaft enclosure; or
2. Terminate in a room having a use related to the purpose of the shaft. The room shall be separated from the remainder of the building by construction having a fire-resistance rating and opening protective at least equal to the protection required for the shaft enclosure.
1. Be enclosed at the highest level with construction of the same fire-resistance rating as the highest floor through which the shaft passes, but not less than the rating required for the shaft enclosure; or
2. Terminate in a room having a use related to the purpose of the shaft. The room shall be separated from the remainder of the building by construction having a fire-resistance rating and opening protective at least equal to the protection required for the shaft enclosure.
All closed shafts, including vertical exit enclosures, having a floor area exceeding 4 square feet (0.37 m2) shall be provided with a smoke vent in accordance with Sections 708.12.1.1 through 708.12.1.3.
Exception: Elevator and dumbwaiter shafts in accordance with Chapter 30.
Exception: Elevator and dumbwaiter shafts in accordance with Chapter 30.
Smoke vents may be constructed as windows, louvers, skylights, vent ducts, or similar devices. Where a vent duct is installed, such vent ducts shall be enclosed by construction having the same fire-resistance rating as required for the shaft enclosure.
The effective venting area shall not be less than 31/2 percent of the maximum shaft area at any floor, but in no event less than 72 square inches (0.05 m2).
Smoke vents shall be located in accordance with Section 708.12.1.3.1 or 708.12.1.3.2, as applicable.
Where a closed shaft or smoke vent duct penetrates through the roof of the building, the vent shall be located as follows:
1. The vent shall be located at least 8 inches (203 mm) above a noncombustible roof assembly or at least 36 inches (914 mm) above a combustible roof assembly.
2. The vent shall be located at least 10 feet (3048 mm) from any window, door, exterior stairway, or interior lot line. The vent may be located no less than 5 feet (1524 mm) from any window or door provided that the vent is located at a point higher than the top of such window or door.
3. Where the vent is constructed as a window or louver, the sill of the window or louver shall be located at least 36 inches (914 mm)(above the roof assembly).
1. The vent shall be located at least 8 inches (203 mm) above a noncombustible roof assembly or at least 36 inches (914 mm) above a combustible roof assembly.
2. The vent shall be located at least 10 feet (3048 mm) from any window, door, exterior stairway, or interior lot line. The vent may be located no less than 5 feet (1524 mm) from any window or door provided that the vent is located at a point higher than the top of such window or door.
3. Where the vent is constructed as a window or louver, the sill of the window or louver shall be located at least 36 inches (914 mm)(above the roof assembly).
Where the exterior wall serves as part of a shaft enclosure or where a smoke vent duct penetrates the exterior wall of the building, no openings shall be located in the wall within a distance of 30 feet (9144 mm) vertically above the vent opening, nor within 5 feet (1524 mm) on either side of the vent opening.