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Title: Section 1202 • Size: 11856
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1202.1 Light. All enclosed portions of Groups A, B, E, F, H, I, M and S Occupancies customarily occupied by human beings shall be provided with natural light by means of exterior glazed openings with an area not less than one tenth of the total floor area, or shall be provided with artificial light. Such exterior openings shall open directly onto a public way or a yard or court as set forth in Section 1203.4. See Section 1012 for required exit illumination.
1202.2.1 General. All enclosed portions of Groups A, B, E, F, H, I, M and S Occupancies customarily occupied by human beings shall be provided with natural ventilation by means of openable exterior openings with an area not less than 1/20 of the total floor area or shall be provided with a mechanically operated ventilation system. Such exterior openings shall open directly onto a public way or a yard or court as set forth in Section 1203.4. Such mechanically operated ventilation system shall be capable of supplying a minimum of 15 cubic feet per minute (7 L/s) of outside air per occupant in all portions of the building during such time as the building is occupied. If the velocity of the air at a register exceeds 10 feet per second (3 m/s), the register shall be placed more than 8 feet (2438 mm) above the floor directly beneath.
Toilet rooms shall be provided with a fully openable
exterior window with an area not less than 3 square feet (0.279
), or a vertical duct not less than
100 square inches (64 516
) in area for
the first water closet plus 50 square inches (32 258
)
additional of area for each additional water closet, or a mechanically
operated exhaust system capable of providing a complete change
of air every 15 minutes. Such mechanically operated exhaust systems
shall be connected directly to the outside, and the point of discharge
shall be at least 3 feet (914 mm) from any opening which allows
air entry into occupied portions of the building.
For ventilation of hazardous vapors or fumes in Group H Occupancies, see Sections 307.5.2 and 1202.2.3 and for Group S, Division 3 Occupancies, see Section 1202.2.7.
Ducts conveying explosives or flammable vapors, fumes or dusts shall extend directly to the exterior of the building without entering other spaces. Exhaust ducts shall not extend into or through ducts and plenums.
EXCEPTION: Ducts conveying vapor or fumes having flammable constituents less than 25 percent of their lower flammability limit may pass through other spaces.
Emissions generated at work stations shall be confined to the area in which they are generated as specified in the Fire Code and the Mechanical Code.
The location of supply and exhaust openings shall be in accordance with the Mechanical Code. Exhaust air contaminated by highly toxic material shall be treated in accordance with the Fire Code.
A manual shutoff control for ventilation equipment required by this subsection shall be provided outside the room adjacent to the principal access door to the room. The switch shall be of the break-glass type and shall be labeled ``Ventilation System Emergency Shutoff.''
EXCEPTION: When approved, ventilating equipment may be omitted in repair garages, enclosed heliports and aircraft hangars when well-distributed unobstructed openings to the outer air of sufficient size to supply necessary ventilation are furnished.
Ventilation systems shall comply with the Mechanical Code except that the automatic shutoffs need not be installed on air-moving equipment. However, smoke detectors shall be installed in the circulating airstream and shall initiate a signal at the emergency control station.
Except for exhaust systems, at least one manually operated remote control switch that will shut down the fabrication area ventilation system shall be installed at an approved location outside the fabrication area.
1202.2.6 Group S repair and storage garages and aircraft hangars. In Group S, Division 3 repair garages, storage garages and in Division 5 aircraft hangars, the mechanical ventilating system required by Section 1202.2.1 may be omitted when, in the opinion of the building official, the building is supplied with unobstructed openings to the outer air which are sufficient to provide the necessary ventilation.
EXCEPTION: Mechanical
ventilation need not be provided within a Group S, Division 3
parking garage when openings complying with Item 2 of Section
311.9.2.2 are provided.
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