Mechanical Contracting & Plumbing January-December 1908 . re than is the casewith the former. In addition to this, thechimney that is up through the centreor inner portion of the building is morelikely to have its top so situated that itis freer and clear of all interfering windcurrents. Under similar conditions more troubleis to be found with chimneys in outsidewalls than those built up through theinterior of the building. More difficultyfrom condensation, rusting out of smokepipes, and wearing out of the interiorparts of furnaces and heaters where theconnection is made to chimney flues lo-ca
Mechanical Contracting & Plumbing January-December 1908 . re than is the casewith the former. In addition to this, thechimney that is up through the centreor inner portion of the building is morelikely to have its top so situated that itis freer and clear of all interfering windcurrents. Under similar conditions more troubleis to be found with chimneys in outsidewalls than those built up through theinterior of the building. More difficultyfrom condensation, rusting out of smokepipes, and wearing out of the interiorparts of furnaces and heaters where theconnection is made to chimney flues lo-cated in exterior walls than in any othercase. A chimney which is damp cannever draw as well as one that is dry. There is a very good and common rea-son why dry interior flues give betterresults than exterior ones that are coldand damp. The warmer the flue, otherthings being equal, the better will be thedraft. The hotter the gases in thechimney the lighter are the gases, and, . 13 consequently, the more intense is thedraft. The smoother the chimney on its. inside the less the friction that will re-tard the flow of the gases. What Causes Draft. The cause of a draft in a chimney isthe difference in weight between the
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