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beams'or'- ceilino are plastered. on metal lath or are protected- by'a metal shield one (1)
<br />inch therefrom, then the';distance shall not be less than two,(2) inches from such ceil-.
<br />ing or sliield. ,
<br />When the $ir coizveyed through pipes iz heated in an ordinary hot air furnace,
<br />or in any other apparatus by direct contact of the air with the fire box, the material
<br />used for these double ducts, pipes and register boxes.shall be bright tin. 1FThere the
<br />aix is heated with hot?water or steam.pipes, any other sheet metal, but of not less
<br />gauge than prescribed for -tin, may be used for the pipes, and the use of, double pipes
<br />is not,obligatoryo , ., , . ,
<br />. . !- .
<br />Sec.177. -STEALr AND HOT `UATER HEATING PItES. Steam and hot water heatirg, pipes
<br />shall not be placed brithiai-two (2) inchea of a.ny timber or vroodworY, vnless the tim-
<br />ber or vJO:odwork is protected by a metal shield, then the distance shall not be less
<br />than one=half (*) inch. All steam or hot water heating pipes passing through floors
<br />and ceilings, 0'r,',.la.th.and plastered partitions shall-be protected by a metal- tube one
<br />(i1) inch larger tn diameter than the-pipe, havin•o a metal cap at the floor.and ceil-
<br />ing, and where they run in or said horizontal pipes shali be coveyed vrith incombusti-
<br />ble pipe covering at least tnree-ouarters (3/4) of an inch thick. In no case shall "
<br />lateril branches from risirg lines to radiators or coils be allovaed betiveen an,y floox
<br />and ceiliiig line when such later,als, :cut into or;. through joists or beams in conflict
<br />with Section 154, Title__IX, and when such pipes are inaccessibly concealed they sha,ll
<br />be covered arith incombustible materials, as provided in Section 177_and 179.
<br />Sec.178. 'V00D. CqSINGS. ; All wood boxes or casings enclosing •steam or hot water
<br />heating pipes, and all woo,d coverings to recesses in walls, in cvh.ich--stearri or hot aua-
<br />ter heating,. pipes are placed, - snall be lined .with -metal,, or _said gipes _ shall be,. cov-
<br />ered ?vith incombustible sectional pipe covering at" least three-quarters (3?4 ) of:an
<br />inch thick. .
<br />, -.Sec.1.79.?'.INC0IBUSTIBZE- PIPE COVERINQ.. = No concealed, pine sh?;ll :be, ,c?ove,red.with
<br />a covering ivlios.e nori-conductivi.ty.depends upon wool, felt or any,other organie matter,
<br />but pipe covering shall be inade of standard fire resisting, covering, either of Ida,gnes-
<br />_iurci'.Carbona.te,'. Calcium.Carboriate with bind'ers of..asbestos fiber, ;or asbestos fiber and
<br />slzeet cod-eririg. ;,: .. : ,' .. . ? .: . ? . ..._ - ; ; ..
<br />. . . , :, ? ? _ .:. ... , ..
<br />Sec.160. DUC.T.S._FOR:PIPES. All ducts for hot ?steam-:or,hho-b, water -pipes shall
<br />be enclos.ed on..a11 si,des, with fireproof rnaterial,; and;-the_:openi,ng through each -floor
<br />shall be properlJ fire-stopped. , ._
<br />-.; ,Sec..181..REGISTERS..,: Registers located-over a brick.furnace shall be supported
<br />by a• brick sha,f.t _buUt :up;.from-_the cove,r of, the hot air chamber,- said sllaft shall be
<br />'lined with a,.metal :pipe,_ and all rvood beams shall be trimmed away not less than four
<br />(4) inches from ita Ur'here a register is pla.ced ozi any ivoodwork in connection with a
<br />meta.l pipe or duct the end of the said pipe or duct shall be flarged over on the wo od-
<br />-worlt urider, it. A1T. register,s for liot air furnaces, placed.in arLy woodwork or colabusti-
<br />ble floors, shall have . stone or -iron .-borders.
<br />All register boxes sha,11. be made of tin olate or.,-galvanized iron.with a flarige
<br />.on the top to._fit the gr.oove in the frame, the regiater,;to -rest. upon the same,. there
<br />shall;be an open *space; o,f two -(2),;inches on all ;sides . of the regist?er box, extending
<br />from the under side of -the border to and through the coiling below... The said openi:ng
<br />slia7.1 be fitted with a tight tin or galvanized iron casing, the upper end of wliich."
<br />shall be turne.d zinder the,frame.._ tiV,hen the regist,er box is placed, in, t4e floor over a
<br />portable 'furnace, the open :space on *: al'1 sides. of the register, ?b.ox sr?all not be less
<br />tllWn tllree (3), inches.,. lVhen only one.:register. is comlected ,??i?tli.a f?a.rnace said regis-
<br />. . • . .1?. .. .
<br />ter shall have no valve. . . _ :.. . -?: .. , .: _; ?4 . . . ._ -
<br />Register boges, .heads -:or. collars in floors or viallsha11 be ma.de double and
<br />- , i? _ , .
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