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When coal is burning slowly, it emits a lot of volitale fumes that are usually transformed into the "black smoke" that is familiar. When coal has an adequate draft, and high enough combustion temperatures, it really is a "clean-burning" fuel. <br /> The key to firing coal is an equilibrium between coal being burned, and adequate oxygen for the fire. ( no air, lots of smoke ), The purpose of the introduction of fresh air over the top of the fire is to allow the volitales to ignite in the flues, before it goes up the chimney. <br /> Todd C.
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