The gross floor area required by Sec. 3280.110 (a) and (b) shall have no clear horizontal dimension less than 5 feet except as permitted by Sec. 3280.102(a). [40 FR 58752, Dec. 18, 1975. Redesignated at 44 FR 20679, Apr. 6, 1979, and further redesignated at 58 FR 55004, Oct. 25, 1993]