24 C.F.R. § 3280.104 Ceiling heights.
Title 24 - Housing and Urban Development
(a) Every habitable room and bathroom shall have a minimum ceiling height of not less than 7 feet, 0 inches for a minimum of 50 percent of the room's floor area. The remaining area may have a ceiling with a minimum height of 5 feet, 0 inches. Minimum height under dropped ducts, beams, etc. shall be 6 feet, 4 inches. (b) Hallways and foyers shall have a minimum ceiling height of 6 feet, 6 inches.
Title 24: Housing and Urban Development
PART 3280—MANUFACTURED HOME CONSTRUCTION AND SAFETY STANDARDS
Subpart B—Planning Considerations
§ 3280.104 Ceiling heights.