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U /..1 'J tI 6-4$A All that part of any chimney above the roof line shall be constructed with pressed brick mater:Laj.. This shall be required regardless or the type of chimney used inside the building or the particular purpose of the chimney, except chimneys described in 6-46 6-46 Fabricated chirrmeys, designed for particular types and methods of heating ?nd meeting or exceeding the runctional requirements speciri- cally mentioned in this code, may be approved by the governing body of the municipality. All such chimneys and material shall be app- roved by the National Board or Fire Underwriters. These chimneys, whcn used shall not require brick tops as speciried in 6-45A. 6-41 No smoke pipe shall be placed within twelve (12) inches or any woodwork or wooden lath or plaster partition or ceiling unless the surface above the plaster be protected by metal lath and plaster of any approved fire resistent material. 6-48 Where smoke pipes pass through a wooden alth and plaster partition, they shall be guarded by galvanized iron ventilated thimbles at least twelve, (12) inches larger in diameter than the pipes or by galvanized iron thim- bles built in at least eight (8) inches of brick work or other incom- bustible material. 6-49 No smoke pipe shall pass through any floor or roor having wooden frame- work or.covering. 6-50 The use of a smoke pipe rather than a chimney shall be prohibited. 6-51 No wooden beams, joists or rarters shall be placed within two (2) inches or the outside face of a chimney whether it be for smoke, air .r.....Im~8t or any other purpose. 6-52 The back and sides of fireplaces herearter erected shall bw of solid masonry or reinforoedcconcrete, not less than eight (8) inches in thick- ness. A lining of fire bfick at least tw (2) inches thick or other' approved material shall be provided unless the thiclmess is twelve inches. , 6-53 Fireplaces shall have hearths of brick, stone, tile or other approved non-combustible material supported on a rireproor slab or on brick trimmer arches. Such hearths shall extend at least,sixteen (16) inches outside of the chimney breast and not less than twelve (12) inches be- yond each side of the fireplace opening along the chimney breast. The combined thiclmess or hearth and supporting construction shall be not less than six (6) inches at any point. 6-54 Wooden forms or centers used in the construction of that part of the supporting construction which is below the hearth or the fireplace shall be removed when the supporting construction or the hearth is conpleted. b-55 No heater shall be placed in a fireplace which does not conform to the requirements of this section or is not provided with a fiue, except electric or gas heaters of a type specifically approved for such installa- tion. 6-56 Ends of all wood joists and girders imbedded in masonry walls shall be fire cut. -30-