O-1954-476 - Laserfiche WebLink

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,.-J-;.. .. '. I , , . . -43- (b) Every such chimney hereafter erected' or altered shall be lined with a flue lining confornrlng to the requirements below. (c) Flue lining::; shall be made of fire clay or other refractory clay 1'J'hich will withstand t.he action of flue gases and resist 'Wi. thout soften- ing or cracking, the tempel'awes to l'lhich they vd.ll be subjected, but not less than 2,0000 Fahrenhei1" or of cast iron of approved quality, form and construction. (d) Required clcY flue linings shall be not less than 518 of an inch thick for the smaller flues and increasing in thickness for the larger flues. (e) Flue lining::: shall be installed ahead of the construction of the chimney as it is carried up, carefully bedded one on the other in Type A, type B or fire clay mortar with close fitting joints left smooth on the inside. (f) Flue lining::: shall start from a point net less than 8 inches below the intake, or, in tt,e case of fireplaces, from the throat of the fire- place. They shall extend, as nearly vertically as possible, for the entire height of the chimney and he extended 4 inches above the top or cap of the chimney. (g) Cleanouts for f lues or fireplaces shall be equipped 'With cast iron doors and frames arranged tOI\3main tightly closed when not in use. (h) When tvro or more flues are contained in the same chinney, at least every third flue sha:l be separated by masonry at least 4 inches thick bonded into the masonry wa.:!.l of the chimney. Where flue linings are not so separated, the joints of adjacent flue linings shall be staggered at least 7 inches. .5. USE 01" FLUES" Chimneys or flues installed for the use of gas appliances but which are not suitable for solid or liquid fuels, shall be plainly and per~ntly labeled, IITHLS FLUE IS FOR THE USE OF GAS ;mJRNING APPLIANCES ONLY." The lab~l shall be attached at a point near where the vent pipe enters the chinmey, or VIIi th a type B gas vent used in place of a chimney, at a point where the type :3 gas vent enters a 'wall, floor or ceiling. 6. FIREPLACES. (a) The back and siCl.es of fireplaces hereafter erected shall be of solid masonry or reinforced concrete, not less than 8 inches in, thic1mess. A lining of fire brick at le9.st 2 inches thick or other approved material shall be provided unless the thiclmess is 12 inches.