Abstract: A burner assembly includes a blower assembly couplable to a source of fuel, and a longitudinally elongated housing having a lateral upstream edge, a lateral downstream edge, and a slot formed in the downstream edge. The housing encloses a combustion chamber comprising a generalized cylinder with cross-section having an arcuate portion and a straight portion, the arcuate portion defined by the lateral upstream and downstream edges of the housing. The burner assembly also includes an elongated burner head assembly, the elongated burner head assembly having a first end coupled to the blower and a second end disposed within the combustion chamber.

Abstract: A direct gas-fired burner assembly is disclosed in which a two-stage flame is produced. A gas manifold is attached to two baffles with apertures disposed therein. The apertures are designed such that a fuel rich zone occurs near the manifold, while a lean zone occurs away from the manifold. At high fire, the apertures create a negative pressure zone which draws the gas away from the burner thereby allowing a primary flame to burn. The primary flame in the fuel rich zone ignites a secondary flame in the lean zone. Because a flame is burning throughout the entire combustion zone, the flame does not move out past the baffles, the flame remains smaller and cooler, and a lower output of pollutants is achieved.

Abstract: A direct-air, gas-fired air makeup heating unit is disclosed which provides reduced nitrogen dioxide emissions with a higher temperature rise. The unit includes a combustion chamber with a protective chamber downstream of the combustion chamber. At high firing intensity, the flame exits the combustion chamber and enters the protective chamber. The resulting flame is therefore protected from excess air moving around the combustion chamber, thereby lowering nitrogen dioxide emissions even at such high firing intensities.

Abstract: A damper for a burner includes a gate plate that moves generally parallel to the inlet of a blower housing of the burner. The gate plate rotates parallel to the inlet and is sized and positioned so that it can rotate between a position completely covering the inlet and a position leaving the inlet completely uncovered. A seal assembly between the gate plate and the inlet substantially seals a gap between the gate plate and the inlet. An actuator moves the gate plate automatically to close the damper or open the damper to any of a plurality of open damper positions.

Abstract: A burner assembly includes a generally cylindrical burner tube having a combustion chamber. The burner tube supplies combustion air and combustion gas to the combustion chamber. A burner head assembly is disposed in the burner tube upstream of the combustion chamber. The burner head assembly includes a plurality of flame retention plates having a plurality of changeable flame retention plates removably mounted thereto. The flame retention plates include a base plate, at least one intermediate plate, and a top plate. Each of the base plate, the intermediate plate, and the top pate includes a plurality of combustion air flow and combustion gas flow apertures.

Abstract: A burner assembly includes a generally cylindrical burner tube having a combustion chamber. The burner tube supplies combustion air and combustion gas to the combustion chamber. A burner head assembly is disposed in the burner tube upstream of the combustion chamber. The burner head assembly includes a plurality of flame retention plates having a plurality of changeable flame retention plates removably mounted thereto. The flame retention plates include a base plate, at least one intermediate plate, and a top plate. Each of the base plate, the intermediate plate, and the top pate includes a plurality of combustion air flow and combustion gas flow apertures.

Abstract: A burner assembly having improved BTU output, flame stability and starting reliability is provided. The burner includes a retention plate at an output end of a gas supply line having a central hub from a which a plurality of spokes radially extend. The retention plate and gas supply line are provided within an outer sleeve of the burner. The retention plate occupies a relatively small cross-sectional area of the sleeve. Accordingly, large amounts of combustion air can be forced through the sleeve, with controlling air flow paths being created by apertures provided in each of the spokes. A pilot, including a circumferential spark gap, is provided to improve starting reliability.

Abstract: A burner assembly having improved BTU output, flame stability and starting reliability is provided. The burner includes a retention plate at an output end of a gas supply line having a central hub from a which a plurality of spokes radially extend. The retention plate and gas supply line are provided within an outer sleeve of the burner. The retention plate occupies a relatively small cross-sectional area of the sleeve. Accordingly, large amounts of combustion air can be forced through the sleeve, with controlling air flow paths being created by apertures provided in each of the spokes. A pilot, including a circumferential spark gap, is provided to improve starting reliability.