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Federal Register / Vol. 86, No. 7 / Tuesday, January 12, 2021 / Rules and Regulations j, respectively, and add new paragraph d to read as follows:
3280.5

Data plate.

d The applicable statement:
This manufactured home IS designed to accommodate the additional loads imposed by the attachment of an attached accessory building or structure in accordance with the manufacturer installation instructions. The additional loads are in accordance with the design loads identified on this Data Plate; or This manufactured home IS NOT
designed to accommodate the additional loads imposed by the attachment of an attached accessory building or structure in accordance with the manufacturer installation instructions.

6. In 3280.11, revise paragraph d to read as follows:
3280.11

Certification label.

d The label must be located at the taillight end of each transportable section of the manufactured home approximately 1 foot up from the floor and 1 foot in from the road side, or as near that location on a permanent part of the exterior of the manufactured home section as practicable. The road side is the right side of the manufactured home when one views the manufactured home from the tow bar end of the manufactured home. If locating the label on the taillight end of a transportable section will prevent the label from being visible after the manufactured home section is installed at the installation site, the label must be installed on a permanent part of the exterior of the manufactured home section, in a visible location as specified in the approved design.
7. In 3280.103, revise paragraph b introductory text and add paragraph d to read as follows:
3280.103

Light and ventilation.

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3280.108

Interior passage.

c All interior swinging doors must have a minimum clear opening of 27
inches except doors to toilet compartments in single-section homes see 3280.111b, and doors to closets and pantries.
9. Revise 3280.111 to read as follows:
3280.111

Toilet compartments.

a Each toilet compartment must be a minimum of 30 inches wide, except, when the toilet is located adjacent to the short dimension of the tub, the distance from the tub, to the center line of the toilet must not be less than 12 inches.
At least 21 inches of clear space must be provided in front of each toilet.
b All bathroom passage doors in single-section homes must have a minimum clear opening width of 23
inches, and bathroom passage doors in multi-section homes must have a minimum clear opening width of 27
inches.
10. In 3280.113, redesignate paragraphs b, c, and d as paragraphs c, d, and e, respectively, and add paragraph b to read as follows:
3280.113

Glass and glazed openings.

b Required glazed openings shall be permitted to face into a roofed porch where the porch abuts a street, yard, or court and the longer side of the porch is at least 65 percent open and unobstructed and the ceiling height is not less than 7 feet.

11. Add 3280.114 to read as follows:
3280.114

b Whole-house ventilation. Each manufactured home must be provided with whole-house ventilation having a minimum capacity of 0.035 ft3/min/ft2
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. The following criteria must be adhered to:

d Optional ventilation provisions. As an option to complying with the provisions of paragraphs b and c of
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this section, ventilation systems complying with ANSI/ASHRAE
Standard 62.2 incorporated by reference, see 3280.4 may be used.
8. In 3280.108, add paragraph c to read as follows:

Stairways.

a Stairways1 General. These minimum standards apply to stairways that are designed and constructed as part of the factory-completed transportable sections of a manufactured home, such as interior stairways for multi-level or multi-story homes or external stairways for multilevel construction features that are designed and constructed in the factory on a transportable section and integral to the access and egress needs within the transportable sections of a home.
These standards do not apply to exterior stairways that are built at the home site or stairways to basement areas that are
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not designed and built as part of a transportable section of a manufactured home.
2 Width. Stairways must not be less than 36 inches in clear width at all points above permitted handrail height and below the required headroom height. Handrails must not project more than 412 inches on either side of the stairway and the minimum clear width of the stairway at and below the handrail height, including treads and landings, must not be less than 3112
inches where a handrail is installed on one side and 27 inches where handrails are provided on both sides.
3 Stair treads and risersi Riser height and tread depth. The maximum riser height must not exceed 814 inches and the minimum tread depth must not be less than 9 inches. The riser height must be measured vertically between leading edges of the adjacent treads. The tread depth must be measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the treads leading edge. The walking surface of treads and landings of a stairway must be sloped no steeper than one unit vertical in 48 units horizontal a 2percent slope. The greatest riser height within any flight of stairs must not exceed the smallest by more than 38
inch. The greatest tread depth within any flight of stairs must not exceed the smallest by more than 38 inch.
ii Profile. The radius of curvature at the leading edge of the tread must not be greater than 916 inch. A nosing not less than 34 inch but not more than 114
inches shall be provided on stairways with solid risers. The greatest nosing projection must not exceed the smallest nosing projection by more than 34 inch between two stories, including the nosing at the level of floors and landings. Beveling of nosing must not exceed 12 inch. Risers must be vertical or sloped from the underside of the leading edge of the tread above at an angle not more than 30 degrees from the vertical. Open risers are permitted, provided that the opening between treads does not permit the passage of a 4-inch diameter sphere. A nosing is not required where the tread depth is a minimum of 11 inches. The opening between adjacent treads is not limited on stairs with a total rise of 30 inches or less.
4 Headroom. The minimum headroom in all parts of the stairway must not be less than 6 feet 8 inches, measured vertically from the sloped plane adjoining the tread nosing or from the floor surface of the landing or platform.

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