16 C.F.R. § 1213.2 Definitions.
Title 16 - Commercial Practices
As used in this part 1213: Bed. See Bunk bed. Bed end structure means an upright unit at the head and foot of the bed to which the side rails attach. Bunk bed means a bed in which the underside of any foundation is over 30 inches (760 mm) from the floor. Foundation means the base or support on which a mattress rests. Guardrail means a rail or guard on a side of the upper bunk to prevent a sleeping occupant from falling or rolling out.
Title 16: Commercial Practices
PART 1213—SAFETY STANDARD FOR ENTRAPMENT HAZARDS IN BUNK BEDS
§ 1213.2 Definitions.