Show poor chimney wastes fuel in furnace faulty chimneys u bally are the cause of wasteful fuel combustion in ho nc ne scaling plants cays auy A c technical technical ai se cretaro of the Wit ional warm air heating and air conditioning association writing in Arne american rIcan builder M magazine 9 9 azine gay says that a I 1 flue IU area adequate for rapid removal of and flue gag gat li Is of first consideration he lie explains that the quantity of smoke and gases to be removed d depends end on the kind of fuel and t the he qu quantity an city necessary to maintain ta in the house at a comfortable temperature ho ile says that in areas where coal might be burned by hand firing methods cluer now or later chimney flues should be larger than theoretically necessary in order to offset the effect of soot accumulation soot deposited on flue walls hinders smoke passage soot accumulations in undersized s zed chimney flues present definite fire hazards voorhees writes e chimney fires originate at the bottom of chimneys when soot ignites burning rapidly and intensely such a fire will practically spout the burning chunks of soot out of the chimney and on to the surrounding roof area A warning of the danger of flue ue fires also Is given by the national fire protection association which recommends the use oi of asphalt shingles or other roofing that will not be kindled into flame by chimney sparks or fire brands the lists flammable roofing as a major fire hazard voorhees ea says that the height of the flue is another important factor in chimney design with some types of heating 1 glants plants the chimney must provide ov a strong enough suction iff io draw air into he the combustion space and up through the bed of ash and fuel he points out he recommends in american builder that a heating contractor be called in as a consultant on chimney construction when a home is being built I 1 chimney rebuilding Is ex e en sive he says it la Is certain y many mote more times costly than it would have been to design and supervise proper construe I tion of the chimney finney ch in the first place I 1 |