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(a) Except as provided in subparagraph (b), the aggregate width of openings through a fire wall shall not exceed 25 percent of the length of the wall, except that at least one opening not exceeding the maximum dimensions for fire doors established in Section 15-12-120 shall be permitted in a fire wall of any length.
(b) In buildings of Types I-A, I-B and I-C construction, equipped throughout with an approved system of automatic sprinklers, the aggregate width of all openings at any floor level shall not exceed 50 percent of the length of the wall.
(c) Openings in fire walls shall be protected on both sides of the wall with Class A fire doors or other approved protective assemblies complying with the requirements of Section 15-12-070. One door shall be automatic and the other door shall be either automatic or self-closing.
(Prior code § 62-1.5)