Cyclopedia of heating, plumbing and sanitation; a complete reference work . ashes and soot. Furnaces are made either of cast iron, or of wrought-iron plates riveted together and provided with brick-lined firepots. Types of Furnaces. Furnaces may be divided into two general 80 HEATING AND VENTILATION 21 types known as direct-draft and indirect-draft. Fig. 6 shows a com-mon form of direct-draft furnace with a brick setting; the better classhave a radiator, generally placed at the top, through which the gasespass before reaching the smoke-pipe. They have but one damper,usually combined with a col
Cyclopedia of heating, plumbing and sanitation; a complete reference work . ashes and soot. Furnaces are made either of cast iron, or of wrought-iron plates riveted together and provided with brick-lined firepots. Types of Furnaces. Furnaces may be divided into two general 80 HEATING AND VENTILATION 21 types known as direct-draft and indirect-draft. Fig. 6 shows a com-mon form of direct-draft furnace with a brick setting; the better classhave a radiator, generally placed at the top, through which the gasespass before reaching the smoke-pipe. They have but one damper,usually combined with a cold-air check. Many of the cheaper direct-. Pig. t>. A Common Type f Direct-DrafI Furnace in Brick Radiator at Top. draft furnaces have no radiator at all, the gases passing directly intothe smoke-pipe and carrying away much heat that should be utilized. The furnace shown in Fig. G is made of cast iron and has a largeradiator at the top; the smoke connection is shown at the rear. Fig. 7 represents another form of direct-draft furnace. In tinscase the radiator is made of sheet-steel plates riveted together, and theouter casing is of heavy galvanized iron instead of brick. In the ordinary indirect-draft type of furnace (see Fig. 8), thei 3 pass downward through Hues to a radiator located near the , 81 22 HEATING AM) VENTILATION thence upward through another flue to the smoke-pipe. In additionto the damper in the smoke-pipe, a direct-draft damper is requiredto give direct connection with the funnel when coal is firsl put on, tofacilitate the escape of gas to the chimney. When the chimney draft
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