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SECTION 8. ClfASSIFICATION OF OCCUPANCIES. 1. Classes designated. For the purposes of this code, build- ings are classified, with respect to occupancy and use, as public buildings, institutional buildings, residence buildings, business buildings and storage buildings. (a)~ Public building means a building in which persons con- gregate for civic, political, educational, religious, social or recrea- tional purposes; including among others, armories, assembly halls, auditoriums, bath houses, bowling alleys, churches, city halls, club rooms, colleges, court houses, dance halls, exhibition buildings, grandstands, gymnasiums, lecture haiis, iibrarit:~, lodge i'ooms, motion picture theaters, museums, passenger stations, recreation piers, restaurants, schools, skating rinks, stadiums and theaters. 6 '. . (a). Every series of openings above one another in two or more successive floors, or floors and roof, hereafter placed or con- structed in a building or hereafter eniarged or aitered lu l:hange the use of the shaft, shall be so protected as to prevent fire in any 31 SECTION 30. SHAFTS. 1. Protection required. veneered wall means a wall having a facing which is tached and bonded to the backing so as to form an integral the wall for purposes of load bearing and stability. not at- part of non-bearing wall than its own weight; panel wall means a non-bearing wall piers and wholly supported at each story wall party wall means tween two buildings a used 0"1: adapted built for between columns or joint service be- Every building, except dwellings, churches, buildings of wood frame construction and of unprotected metal construction, and open air parking garages shall have approved fire windows or other ap- proved protectives, in every opening in the exterior walls when such opening faces on a street and is less than 30 feet from the opposite building line, or when such opening is less than 30 feet distant in a direct unobstructed line from an opening in another building, or when such opening is above and not more than 30 feet distant from any part of a neighboring roof of combustible construction, or any roof having openings within this distance; provided that such pro- tection shall not be required for show windows facing on a street which do not extend above the first full story above grade; and pro- vided further that such protection shall not be required when the opening to be protected and the opening against which it is to be protected are situated in walls in the same plane or in parallel planes and are facing in the same direction. means a wall which supports no load other . '. SECTION INGS. hollow wall of mas(mry means a wall built of masonry units so arranged as to provide an air space wtihin the wall, and in which the inner and outer parts of the wall are bonded together with masonry units; 29. PROTECTION OF EXTERIOR OPEN- foundation wall means a wall below the first floor extending below the adjacent ground level and serving as support for a wall, pier, column or other structural part of a building; 2. Openings. (a). Required fire partitions shall have no openings other than required door openings, or properly protected duct openings. (b). Each opening in a required fire partition shall be equipped with an approved fire door set in an approved door frame. Each opening in a fire partition serving as a horizontal be protected by an approved self-closing fire door. (c). exit shall fire wall means a wall constructed in accordance with section 26, for the purpose of subdividing a building or separating buildings to restrict the spread of fire and which starts at the foundation and extends continuously through all stories to and above the roof, except where the roof is fireproof or semi fireproof and the wall is carried up tightly against the under side of the roof slab. II fire partition means a partition constructed in accordance with section 28, for the purpose of restricting the spread of fire or to provide an area of refuge, but not necessarily continuous through all stories nor extended through the roof. e e Walls bearing wall means a wall which supports any vertical load in addition to its own weight; cavity wall means a wall built of masonry units or of plain . concrete, or a combination of these materials, so arranged as to pro- vide an air space within the wall, and in which the inner and outer parts of the wall are tied together with metal ties; faced wall means a wall in which the masonry facing and back- ing are so bonded as to exert common action under load . e - the requirements for bearing walls in sections 24 and 25, in addition to meeting the requirements of this section. (b). Fire partitions shall be supported in each story on con- struction having a fire resistance rating of not less than 2 hours; provided that when they also are load bearing, the supporting con- struction shall have a fire resistance rating of 'not less than 4 hours in case the building is of fireproof construction or semifireproof construction, and not less than 3 hours in case of other construction. (c). The maximum unsupported height of a fire partition shall not exceed 18 times its total thickness unless su~tably reinforced and anchored at floor and ceiling or unless substantially secured to vertical supports at intervals of not over 18 times the thickness. (d). Fire partitions shall be deemed continuous, even though the several parts ;,tre not directly over one another in successive stories if the intervening parts of the floors at the levels where off- sets occur, are unpierced and of fireproof construction or semifire- proof construction and all parts not supported directly on the foundations are carried on fireproof construction.