Public space shall meet the following requirements:
A.
Height. The minimum height of any public space shall
comply with generally accepted standards.
B.
Light and ventilation. Public spaces shall be provided
with artificial light and ventilation as follows:
(1)
All public spaces shall be provided with artificial
light.
(2)
In public stairs, stairways and passageways, such
artificial light shall be electric lighting available at all times
so as to afford safe passage for occupants and users. Such lighting
shall conform to the following:
(a)
A sufficient number of fixtures shall be provided
so that the distance between fixtures is not more than 30 feet and
so that no wall is more than 15 feet distant from a fixture.
(b)
Incandescent lighting shall be based on not
less than 1/4 watt per square foot of floor area, except that each
fixture shall have a lamp or lamps of a total of not less than 15
watts.
(c)
Fluorescent lighting shall be based on not less
than 1/10 watt per square foot of floor area, except that each fixture
shall have a lamp or lamps of a total of not less than 15 watts.
(d)
Where under these formulas the calculated wattage
does not correspond to that of a standard lamp, the next larger size
shall be used.
(3)
Public spaces shall be provided with either natural
ventilation conforming to the requirements for habitable space or
with mechanical ventilation.
Nonhabitable space shall conform to the following
requirements:
A.
Height. Nonhabitable space, except crawl spaces and
attics, in multiple dwellings shall comply with generally accepted
standards.
B.
Toilet rooms and bathrooms. Toilet rooms and bathrooms
shall meet the following requirements:
C.
Light and ventilation. Nonhabitable space shall have
the following light and ventilation requirements:
(1)
Kitchenettes, bathrooms and toilet rooms shall be
provided with ventilation by natural means as required for habitable
space, except that openable areas shall not be less than 1 1/2
square feet for bathrooms or toilet rooms and not less than three
square feet for kitchenettes. In the alternative, such rooms may be
provided with mechanical ventilation exhausting not less than 25 cubic
feet per minute for bathrooms and toilet rooms and not less than 100
cubic feet per minute for kitchenettes.
(2)
Ventilation shall be provided in unheated attics,
spaces below flat roofs and crawl spaces. The location and net areas
of ventilation openings shall be such as to minimize the deterioration
of structural members from condensation or other causes, in conformity
with generally accepted standards.
(3)
Spaces in structures which contain central heat-producing,
air-conditioning and other equipment shall be ventilated to the outer
air, and air from these spaces shall not be recirculated to other
parts of the building, and other spaces shall be fire retardant.
Stairs, both interior and exterior, shall be
sufficient width, tread and riser, in conformity with generally accepted
standards so as to serve the occupants, and any overhead area shall
be clear to height of six feet six inches, measured vertically from
the surface of the tread and maintained in good repair. Railings shall
be provided on open portions of stairs, balconies, landings and stairwells
and on one side of all stairwells.
Safe, continuous and unobstructed exits shall
be provided from the interior of the building to the exterior at street
or grade level. Exits shall be arranged, constructed and proportioned
so that occupants may escape safely from the building in case of emergency.
In one- and two-family dwellings, in addition to a primary exit from
the building, there shall be provided a secondary exit or, in lieu
thereof, one or more exit openings for emergency use not less than
30 inches wide with an area of not less than nine square feet. Where
any exit is at a height of more than 14 feet above grade, exterior
metal stairs must be provided to the dwelling unit or rooming unit
in which such exit is located.
