The provisions of this regulation shall govern
the minimum standards for basic equipment and facilities used for
light and ventilation of a structure.
In place of the means for natural light and
ventilation prescribed in this code, alternative arrangement of windows,
louvers, or other devices or methods that will provide the equipment
minimum performance requirements shall be permitted.
A.
All areas in a structure shall be provided sufficient
light so as not to endanger health and safety. All areas in a structure
shall be provided with natural light or equipment to accommodate artificial
light of sufficient intensity and distribution so as to permit the
maintenance of sanitary conditions and the safe use of the area and
the appliances, equipment and fixtures.
B.
Common halls and stairways. Each common hall and stairway
in a structure, other than one- and two-family structures, shall be
adequately lighted at all times with an illumination equivalent to
at least a sixty-watt standard incandescent light bulb for each 200
square feet of floor area, provided that the spacing between lights
may not be greater than 30 feet. Every exterior stairway and exit
shall be illuminated.
A.
All areas in a structure shall be provided sufficient
ventilation so as not to endanger health and safety.
B.
Mechanical ventilation.
(1)
When mechanical ventilation is provided instead of
natural ventilation, the mechanical ventilating system shall be maintained
in operation during the occupancy of the structure or portion of it.
(2)
When part of the air provided by a mechanical ventilation
system is recirculated, the portion or volume of air recirculated
may not be recirculated to a different habitable area.
