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1. In every story, basement or cellar of all buildings except Group I Occupancies when the floor area exceeds fifteen hundred square feet (1500 sq. ft.) and there is not provided at least twenty square feet (20 sq. ft.) of opening entirely above the adjoining ground level in each fifty lineal feet (50 lin.ft.) or fraction thereof of exterior wall in the story, basement or cellar on at least one side of the building. Openings shall have a minimum dimension of not less than thirty inches (30"). Such openings shall be maintained readily accessible to the Fire Department and shall not be obstructed in a manner that fire fighting or rescue cannot be accomplished from the exterior. When openings in a story are provided on only one side and the opposite wall of such story is more than seventy-five feet (75') from such openings, the story shall be provided with an approved automatic fire-extinguishing system or openings as specified above shall be provided on at least two sides of the exterior walls of the story. If any portion of a basement or cellar is located more than seventy-five feet (75') from openings required in this Section, the basement or cellar shall be provided with an approved automatic fire-extinguishing system. 2. Under the roof and gridiron, in the tie and fly galleries and in all places behind the proscenium wall of stages, over enclosed platforms in excess of five hundred square feet (500 sq. ft.) in area; and in dressing rooms, workshops and store- rooms accessory to such stages or enclosed platforms. EXCEPTIONS: 1. Stages or enclosed platforms open to the auditorium room on three or more sides. 2. Altars, pulpits, or similar platforms and their accessory rooms. 3. State gridirons when side wall sprinklers with 135°F. rated heads with heat-baffle plates are installed around the entire perimeter of the state at points not more than thirty inches (30") below the gridiron, nor more than six inches ''(6") below the baffle plate. 4. Understage or under enclosed platform areas less than four feet (4') in clear height used exclusively for chair or table storage and lined on the inside with materials approved for one-hour fire-resistive construction. 3. In any enclosed, usable space below or over a stairway in groups B, C, and D Occupancies. See Section 3308 (f) also. EXCEPTION: Type I or II buildings. 4. In basements or cellars larger than fifteen hundred square feet (1500 sq. ft.) in floor area of Groups A, B, and C Occupancies. 5. In all Group D Occupancies except jails, prisons and reformatories; however, the respective increases for area and height set forth in Sections 506(c) and 507 shall be permitted. 6. In Group E, Divisions 1 and 2 Occupancies having an area of more than fifteen hundred square feet (1500 sq. ft.); in Group E, Division 3 Occupancies having an area of more than three thousand square feet (3000 sq. ft.); and in Group E, Division 4 Occupancies more than one story in height. 7. At the top of rubbish and linen chutes and in their terminal room in other than Group I Occupancies. Chutes ex- tending through three or more floors shall have additional sprinkler heads installed within such chutes at alternate floors. Sprinkler heads shall be accessible for servicing. -5-