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3004.1 Vents Required
Hoistways of elevators and dumbwaiters penetrating more than three stories shall be provided with a means for venting smoke and hot gases to the outer air in case of fire.
Exception: Venting is not required for the following elevators and hoistways:
  1. In occupancies of other than Groups R-1, R-2, I-1, I-2 and similar occupancies with overnight sleeping units, where the building is equipped throughout with an approved automatic sprinkler system installed in accordance with Section 903.3.1.1 or 903.3.1.2.
  2. Sidewalk elevator hoistways.
  3. Elevators contained within and serving open parking garages only.
  4. Elevators within individual residential dwelling units.
3004.2 Location of Vents
Vents shall be located at the top of the hoistway and shall open either directly to the outer air or through noncombustible ducts to the outer air. Noncombustible ducts shall be permitted to pass through the elevator machine room, provided that portions of the ducts located outside the hoistway or machine room are enclosed by construction having not less than the fire-resistance rating required for the hoistway. Holes in the machine room floors for the passage of ropes, cables or other moving elevator equipment shall be limited as not to provide greater than 2 inches (51 mm) of clearance on all sides.
3004.3 Area of Vents
Except as provided for in Section 3004.3.1, the area of the vents shall be not less than 31/2 percent of the area of the hoistway nor less than 3 square feet (0.28 m2) for each elevator car, and not less than 31/2 percent nor less than 0.5 square feet (0.047 m2) for each dumbwaiter car in the hoistway, whichever is greater. Of the total required vent area, not less than one-third shall be permanently open. Closed portions of the required vent area shall consist of openings glazed with annealed glass not greater than 1/8 inch (3.2 mm) in thickness.
Exception: The total required vent area shall not be required to be permanently open where all the vent openings automatically open upon detection of smoke in the elevator lobbies or hoistway, upon power failure and upon activation of a manual override control. The manual override control shall be capable of opening and closing the vents and shall be located in an approved location.
3004.3.1 Reduced Vent Area
Where mechanical ventilation conforming to the International Mechanical Code is provided, a reduction in the required vent area is allowed provided that all of the following conditions are met:
  1. The occupancy is not in Group R-1, R-2, I-1 or I-2 or of a similar occupancy with overnight sleeping units.
  2. The vents required by Section 3004.2 do not have outside exposure.
  3. The hoistway does not extend to the top of the building.
  4. The hoistway and machine room exhaust fan is automatically reactivated by thermostatic means.
  5. Equivalent venting of the hoistway is accomplished.
3004.4 Plumbing and Mechanical Systems
Plumbing and mechanical systems shall not be located in an elevator hoistway enclosure.
Exception: Floor drains, sumps and sump pumps shall be permitted at the base of the hoistway enclosure provided they are indirectly connected to the plumbing system.

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