Eclipse Linnox ULE burner is designed for use in any direct- or indirect-fired air-heating application. Features include excellent heat distribution, temperature uniformity, low emissions, and robust controls. Burner operation is based on a high excess air premix combustion that keeps flame temperatures low while burner geometry establishes an internal recirculation flame pattern. This allows for very low emissions at a high turndown rate (10:1) while maintaining stable combustion. Specifically, the emissions in the undiluted flue gases are less than 15 ppm NOX at nominal input. The Linnox Tee ULE configuration option provides multiple rows of burner modules to increase burner inputs up to 45 million BTU/hr.