National boilers, radiators, and specialties: catalog no26 . de and carbon monoxide). Likewise too much air chills thefire — puts it out. The value of the chimney flue consequently depends upon its area andvelocity. Velocity alone is no proof of good draft—there must be sufficientarea to carry the gases of combustion. It is better to build the chimney fluein generous area and height, for the flue can be choked down by a chimney that is too small is always a failure. The correct way is tobuild a chimney that is of the right size to suit the cubical contents andexposure of the buildi
National boilers, radiators, and specialties: catalog no26 . de and carbon monoxide). Likewise too much air chills thefire — puts it out. The value of the chimney flue consequently depends upon its area andvelocity. Velocity alone is no proof of good draft—there must be sufficientarea to carry the gases of combustion. It is better to build the chimney fluein generous area and height, for the flue can be choked down by a chimney that is too small is always a failure. The correct way is tobuild a chimney that is of the right size to suit the cubical contents andexposure of the building, also the altitude of the city. 107 DATA FOR THE FITTER Chimneys (Continued) The most important feature about a chimney, aside from its area andheight, is that it should run above the highest point of the roof. It shouldbe located with reference to higher buildings in order that wind currents willnot form and force the air downward in the flue. Figure Kos. 1, 2 and 3show chimneys as commonly installed and the dotted lines as they shouldbe Figure No. 1 Figure No. 2 ^XS
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