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" (3) Between stair stringers at least once in the <br /> middle portion of each run, at top and bottom, and between <br /> studs, along and_ in line with run of stair adjoining stud <br /> walls and partitions. <br /> " (4) Around top, bottom, sides� and ends of sliding <br /> door pockets. <br /> " (5) In spaces between chimneys and wood framing, <br /> ,� loose incombustib le materials shall be placed in incombust- <br /> ible supports, or metal collars tightly fitted in the chimney <br /> and nailed to wood framing. <br /> " {6) Any other locations not specif ically mentioned <br /> above, such as holes for pipes, shafting, behind furring <br /> strips, and similar places which could afford a passage <br /> for flames. <br /> "Fire stops when of wood shall be two inch nominal <br /> thickness. If width of opening is such that more than one <br /> piece of lumber is necessary, there shall be two thicknesses <br /> of one inch material with joints broken." <br /> SECTION 12. Section 2516 of the Building Code is hereby � <br /> amended to read as follows: <br /> "Section 2516. (a) Foundation Ventilation. The <br /> space between the bottom of floor joists and the ground of <br /> any building (except such space as is occupied by a base- <br /> ment or cellar) shall be provided with a sufficient number <br /> of ventilating openings through foundation walls or exter- <br /> ior walls to insure ample ventilation, and such openings <br /> shall be covered with corrosion resistant wire mesh not <br /> greater than one-half inch nor less than one-fourth inch <br /> in any dimension. The minimum total area of ventilating <br /> -7- <br />