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It is best to burn wood quick to get the most heat from it. A sluggish, smoky fire can lose as much as a third of the heat in the fuel. For  Full Article , the fire must get enough oxygen. A high smoke stack, a mechanical draft fan, or both are commonly utilized to make sure that the draft (circulation of air into the firebox) is adequate.

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If air is forced into the combustion chamber too quick, it tends to "blow out" the fire. The result is similar as too little air. Requiring too much air into the combustion chamber can also lead to puffing. Puffing is actually a series of explosions that result from the violent blending of air and wood gases.

The intense heat from the coals can drive off big volumes of combustible gases that occasionally ignite as oxygen appears. These surges rarely cause any damage to the system but the resulting backfire can cause burns and flying ashes. Lots of substances are formed throughout the combustion of wood. More than 160 various ones have been recognized in the smoke alone.

Although these substances will burn at relatively low temperatures, the majority of the staying substances launched, such as smoke and tar, will not burn completely till the temperature reaches more than 1,000 F. Thus, a hot firebox is needed for complete combustion. In many properly designed hot-water systems the firebox is surrounded by water.

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The water keeps the firebox walls reasonably cool, which results in excellent heat transfer but does not promote great combustion. In a lot of cases it is necessary to insulate the walls and floor of the firebox with firebrick. The firebrick slows the motion of heat away from the fire and thus increases combustion effectiveness.

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Although the red brick is not quite as effective, it costs about one-fifth as much as white firebrick. Figure 1 reveals a cross-sectional view of a normal hot-water heating unit. It is really crucial that a water-jacketed combustion chamber be developed big enough. It must be sized not only to accept a charge of fuel but likewise to enable room for the broadening combustion gases to be completely burned prior to they lose too much heat and pass into the firetubes.