[Code of Federal Regulations]
[Title 24, Volume 5]
[Revised as of April 1, 2008]
From the U.S. Government Printing Office via GPO Access
[CITE: 24CFR3280.103]

[Page 113-114]
 
                 TITLE 24--HOUSING AND URBAN DEVELOPMENT
 
 CHAPTER XX--OFFICE OF ASSISTANT SECRETARY FOR HOUSING--FEDERAL HOUSING 
        COMMISSIONER, DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT
 
PART 3280_MANUFACTURED HOME CONSTRUCTION AND SAFETY STANDARDS--Table of Contents
 
                    Subpart B_Planning 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 
greater.
    (b) Whole-house ventilation. Each manufactured home must be provided 
with whole-house ventilation having a minimum capacity of 0.035 ft\3\/
min/ft\2\ of interior floor space or its hourly average equivalent. This 
ventilation capacity must be in addition to any openable window area. In 
no case shall the installed ventilation capacity of the system be less 
than 50 cfm nor more than 90 cfm. The following criteria must be adhered 
to:
    (1) The ventilation capacity must be provided by a mechanical system 
or a combination passive and mechanical system. The ventilation system 
or provisions for ventilation must not create a positive pressure in Uo 
Value Zone 2 and Zone 3 or a negative pressure condition in Uo Value 
Zone 1. Mechanical systems must be balanced. Combination passive and 
mechanical systems must have adequately sized inlets or exhaust to 
release any unbalanced pressure. Temporary pressure imbalances due to 
gusting or high winds are permitted.
    (2) The ventilation system or provisions for ventilation must 
exchange air directly with the exterior of the home, except the 
ventilation system, or provisions for ventilation must not draw or expel 
air with the space underneath the home. The ventilation system or 
provisions for ventilation must not draw or expel air into the floor, 
wall, or ceiling/roof systems, even if those systems are vented. The 
ventilation system must be designed to ensure that outside air is 
distributed to all bedrooms and main living areas. The combined use of 
undercut doors or transom grills connecting those areas to the room 
where the mechanical system is located is deemed to meet this 
requirement.
    (3) The ventilation system or a portion of the system is permitted 
to be integral with the home's heating or cooling system. The system 
must be capable of operating independently of the heating or cooling 
modes. A ventilation system that is integral with the heating or cooling 
system is to be listed as part of the heating and cooling system or 
listed as suitable for use with that system.
    (4) A mechanical ventilation system, or mechanical portion thereof, 
must be

[[Page 114]]

provided with a manual control, and must be permitted to be provided 
with automatic timers or humidistats.
    (5) A whole-house ventilation label must be attached to the whole-
house ventilation control, must be permanent, and must state: ``WHOLE-
HOUSE VENTILATION''.
    (6) Instructions for correctly operating and maintaining whole-house 
ventilation systems must be included with the homeowner's manual. The 
instructions must encourage occupants to operate these systems whenever 
the home is occupied, and must refer to the labeled whole-house 
ventilation control.
    (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 
cook top.
    (3) Each bathroom and separate toilet compartment shall be provided 
with a mechanical ventilation system capable of exhausting 50 cfm to the 
outside 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, as amended at 70 FR 72042, Nov. 30, 2005]