Interior, or Panels therefor, with or without integral doors, constructed with metal or wood frames and rigid facings, also applies on accompanying hardware, angles, bars, castings, chain, cable, guides, hoods, pipe, rollers, springs, motors, sprockets, track, hinges, sheaves, brackets, handles, locks, hangers, rails, hooks, pulleys, rods or other fittings when in same package with the doors, door sections, grilles, partitions or shutters, or, when in shipments of 36,000 pounds or more, separate packages, Cores (all space within frames and between facings) must be of cellular or solid construction or consist of insulating materials. Rigid facings may be of any material or combination of materials and does not apply on: (1) Freestanding panels, partitions or screens. For applicable provisions, see item 82270. (2) Cooling or freezing room panels or walls. For applicable provisions, see items 53025 and 53180. in boxes or crates: