[Title 24 CFR 3280.103]
[Code of Federal Regulations (annual edition) - May 1, 2001 Edition]
[Title 24 - HOUSING AND URBAN DEVELOPMENT]
[Chapter Xx - OFFICE OF ASSISTANT SECRETARY FOR HOUSING--FEDERAL HOUSING]
[Part 3280 - MANUFACTURED HOME CONSTRUCTION AND SAFETY STANDARDS]
[Subpart B - Planning Considerations]
[Sec. 3280.103 - Light and ventilation.]
[From the U.S. Government Printing Office]
24HOUSING AND URBAN DEVELOPMENT52001-05-012001-05-01falseLight and ventilation.3280.103Sec. 3280.103HOUSING AND URBAN DEVELOPMENTOFFICE OF ASSISTANT SECRETARY FOR HOUSING--FEDERAL HOUSINGMANUFACTURED HOME CONSTRUCTION AND SAFETY STANDARDSPlanning Considerations
Sec. 3280.103 Light and ventilation.
(a) Lighting. Each habitable room shall be provided with exterior
windows and/or doors having a total glazed area of not less than 8
percent of the gross floor area.
(1) Kitchens, bathrooms, toilet compartments, laundry areas, and
utility rooms may be provided with artificial light in place of windows.
(2) Rooms and areas may be combined for the purpose of providing the
required natural lighting provided that at least one half of the common
wall area is open and unobstructed, and the open area is at least equal
to 10 percent of the combined floor area or 25 square feet whichever is
(b) Whole house ventilation. Each manufactured home shall be capable
of providing a minimum of 0.35 air changes per hour continuously or at
an equivalent hourly average rate. The following criteria shall be
(1) Natural infiltration and exfiltration shall be considered as
providing 0.25 air changes per hour.
(2) The remaining ventilation capacity of 0.10 air change per hour
or its hourly average equivalent shall be calculated using 0.035 cubic
feet per minute per square foot of interior floor space. This
ventilation capacity shall be in addition to any openable window area.
(3) The remaining ventilation capacity may be provided by: a
mechanical system, or a passive system, or a combination passive and
mechanical system. The ventilation system or provisions shall not create
a positive pressure in Uo value Zones 2 and 3 or a negative pressure
condition in Uo value Zone 1. Mechanical systems shall be balanced.
Combination passive and mechanical systems shall have adequately sized
inlets or exhaust to release any unbalanced pressure. Passive systems
shall have inlets and exhaust of sufficient size to alleviate unbalance
pressure conditions under normal conditions. Temporary imbalances due to
gusting or high winds are permitted.
(4) The ventilation system or provision shall exchange air directly
with the exterior of the home, except it shall not draw or expel air
with the space underneath the home. The ventilation system or provision
shall not draw or expel air into the floor, wall, or ceiling/roof
systems even if those systems are vented.
(5) The ventilation system or a portion thereof may be integral with
the homes heating or cooling system. The system shall be capable of
operating independently of the heating or cooling modes. A ventilation
system that is integral with the heating or cooling system shall be
listed as part of the heating and cooling system or listed as suitable
for use therewith.
(6) A mechanical ventilation system, or mechanical portion thereof,
shall be provided with a manual control and may be provided with
automatic timers or humidistats.
(7) Substantiation of the ventilation capacity to provide 0.10 ACH
shall be provided for a mechanical system, or a passive system, or a
combination passive and mechanical system.
(c) Additional ventilation. (1) At least half of the minimum
required glazed area in paragraph (a) of this section shall be openable
directly to the outside of the manufactured home for unobstructed
ventilation. These same ventilation requirements apply to rooms combined
in accordance with Sec. 3280.103(a)(2).
(2) Kitchens shall be provided with a mechanical ventilation system
that is capable of exhausting 100 cfm to the outside of the home. The
exhaust fan shall be located as close as possible to the range or cook
top, but in no case farther than 10 feet horizontally from the range or
(3) Each bathroom and separate toilet compartment shall be provided
with a mechanical ventilation system capable of exhausting 50 cfm to the
of the home. A separate toilet compartment may be provided with 1.5
square feet of openable glazed area in place of mechanical ventilation,
except in Uo value Zone 3.
[58 FR 55003, Oct. 25, 1993]