Abstract: A combustion device is described by several embodiments to enable efficient, clean burning of fuel in combustors. In stove and fireplace embodiments, primary, secondary and tertiary air supplies are provided within a firebox at selected locations relative to an upwardly inclined baffle to maximize combustion of particulates and gases. The primary air feed includes openings above the intended coal bed and includes an intake partially spaced from the firebox to maintain incoming primary air cool and oxygen rich, and to avoid direct impingement with the fuel bed. Secondary air is provided adjacent a forward downturned end of the insulated baffle to produce turbulence and supply oxygen to support combustion adjacent to baffle edge. Tertiary air tubes receive air from side chambers that in turn are connected to air delivery ducts situated with respect to the firebox to maintain a desired range of 250.degree.-650.degree. F. of incoming airstreams admitted by the tubes just under the baffle.