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The use -of gas burners or heaterp,- located in a floor system tulder an o-
<br />pen register, or on the outside of the firepot of any hot air furnace, in vihich the
<br />products of combustion are al]:owed to escape into a room, is hereby prohibitedo
<br />Sec.174. SPEOKE PIPES'. Vomere smoke pipes pass through a wood or plastered
<br />stud partition or flurred ttrall, or floor, they shall be surrounded wither by a, bod,y
<br />of hard incombustible material, measuriit at least four (4?- inches e.ll arotiu-A such
<br />smoke pipe or they ghall be surrounded py, a double safety thimble of sheet metal
<br />made or two (2) concentric rings of sheet metal, at least one (l)•inch apart, and
<br />the entire thimble so constructed that there vuill be a circulation of air between
<br />the two (2) rings formirig sarae. No smoke pipe shall project through an external
<br />wall u.nless boruZeeted with a chimney or metal stack carried above the roof.
<br />' No stove or smoke pipe or ar,y piXie conducting the products of combustion
<br />from aij,y range, overri; o? reater sh.all be-,onncealed in any tvood partition, or be
<br />placed-nearer than nine 9) inches to any flnprotected lath?and plaster or board
<br />partition, ceiling or any w?oodvJOrk. - ' S4noke pipes of less diameter thari twelve (12) inches sha11 be kept at
<br />least twelve (12) incYies distarit from any woodwork, unless the same is properly
<br />protected by a metal shield, in which ca.se: the.,distance shall not be less than
<br />three (3) inches. Smoke pipes of grea.tdr diameter tnan twelve (12) inches and _less area
<br />than six (6) square feet must be kept at least twenty (20) inches from any wood-
<br />work, unless the same is p roperly protected by a shield, in w:nich case the dis-
<br />tance shall not be less than eigh.t (8) incheso Smoke pipes of larger area than six (6) square feet shall be kept at least
<br />three (3) feet distant from any woodwork, unless the same i4 properly pratected by
<br />a shield, in «hich case the distance-shall not be less -Eh.an sixteen (16) inches.
<br />Sec.175. SIUiOFM, PIP?,' SHIELDS. The metal shields prescribed in the previous
<br />section sha11 be at least one•-ancl:t one-half (1? ) the dia,meter of the -pipe in -vvidth
<br />and shall have a ventilated air space of at least one (1) inch petilreen shield and
<br />woodtvork. Incombustible coverings, as prescriUed in Section 179; may be,.suUsti-
<br />tuted for metal shields; or the smoke pipe may be covered as prescribed for steam
<br />pipe in Section 177. • Sec.176. Hot air pipes conveying hot air from hot air furnaces built in be-
<br />tiveen timbers or joists, or throu,;n the same, or through wood floors, or in wood
<br />partitions, or other combustible materials within ten `101 inches of the same, shall
<br />be made double. ' The space betixTeen the two metal pi'pes on all sides shall be at least three-
<br />eighths (3/8) of an inch in the clea.r, and the two pipes shall be_kept•apart from
<br />each other by the }nsertion of a sufficient nuniber of inetallic separ?,tors bet?reen,
<br />one for evex?r t?vo ?2) feet'of leng'uh of the p.ipe. Szch pipes are to be made with
<br />air tight joints, without soldering thein, and shall be securely fastened to t he par-
<br />tions at every ti7o (2) feet interval and at least one-half (2) an inch from any un-
<br />protected ivoodwork. , No vertical hot air pipe shall be placed in a stud partition, or in,a wood
<br />enclosure, unless it be at least one-half (2) of a diameter of the lea.st dii:?ension
<br />of the furnace distant in a horizontal direction from the fzrnace. Hot air pipes in
<br />closets shall be double, with an air space.as prescribed above, and sYiall be p]a ced
<br />. . . ....
<br />at lea.st one,(1) inch .from an,y.unprotected woodwork. riorizontal single hot air
<br />pipes shall be placed six (6) inches belovi the floor.beams or-ceilinb; if the floor
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