Show heat efficiency Is determined by chimney satisfactory service of floating boiler aror or fireplace la Is entirely dependent on oil the proper chimney tills fir due to the fact that the chimney Is entirely responsible for draft which la Is essen tint hut to supply supple air fur for com combustion buntion the chimney top should extend above tile the highest point of the rout root surrounding buildings or high trees treca roust must not be so near that wind cur rents will force air downward tile the hue flue should run as straight ns as possible bleb its outlet at vie the top should not be choked by a cup which might inight redie tile the prea of the op opening enin there should be only one opening Into each flue due tile fatie lj lining la Is usually desir desirable ablo and Is invariably used with joinis joanta well cemented there can be little or no impediment to the drutt draft the nv av enigo six to eight room hout athum have tin on 8 by 12 finelt tile lined flue ir feet high front from basement floor small er homes lionica and bungalows nilly use an ad 8 by 8 inch hue flue 80 bet feet high |