[Code of Federal Regulations] [Title 16, Volume 2] [Revised as of January 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 16CFR1513.2] [Page 578] TITLE 16--COMMERCIAL PRACTICES CHAPTER II--CONSUMER PRODUCT SAFETY COMMISSION PART 1513_REQUIREMENTS FOR BUNK BEDS--Table of Contents Sec. 1513.2 Definitions. As used in this part 1513: 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.