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ClearSign Demonstrates Further 40% NOx Reduction, Sets New Record Of 3 PPM

COLORADO SPRINGS, Colo., June 24, 2013 /PRNewswire/ -- ClearSign Combustion Corporation (NASDAQ: CLIR) today announced that it has measured and documented a further 40% reduction in emissions of Nitrous Oxides (NOx), now down to 3 parts per million (PPM) from its previous record of 5 PPM announced just last month. This most recent demonstration was performed using a prototype burner based on ClearSign's novel Duplex™ Burner Architecture, again in a furnace operating at a temperature of up to 1600 F with excess oxygen concentrations from between 1% and 3%.

The company is making this announcement at the American Boiler Manufacturers' (ABMA) 2013 Summer Meeting in Colorado Springs, CO.

"We are elated to be able to share these exciting results with our industry peers at the ABMA conference," said CEO Rick Rutkowski. "To the best of our knowledge, ClearSign's Duplex Burner Architecture is the first technology platform ever to achieve NOx results like this. Importantly, this has been achieved inside the furnace, promising significant gains in energy efficiency and a dramatically reduced cost of ownership as compared to either traditional burner technology or post-combustion treatments such as Selective Catalytic Reduction (SCR). We believe this represents an industry first, one that may be seen as a market disrupting approach to managing emissions without sacrificing efficiency. This could put ClearSign in an enviable position as we move rapidly towards commercialization of this important technology."

The company announced these new results one day after CTO Joe Colannino delivered his well-received technical paper, "Electrodynamic Combustion Control™ (ECC™) Technology for Combustion Systems" to his technical colleagues and industry senior management at the ABMA.

Colannino commented, "The Duplex Burner Architecture is proving to be a powerful approach to reducing NOx to unprecedented levels, without elevating CO, and while maintaining customary or lower levels of O2 in the stack. Additionally, flame length is dramatically reduced -- by 90% or more -- compared to existing Low-NOx burners. This kind of performance is extremely important in many industries including petrochemical applications where flame shape can play a critical role in affecting throughput. Poor flame pattern and long flames in Low-NOx burners for process heaters can lead directly to constraints that can cost millions of dollars in lost production annually as heater capacity must be reduced to accommodate the elongated flames. ClearSign's Duplex technology appears to eliminate the tradeoffs inherent in traditional NOx abatement approaches -- tradeoffs I and other combustion engineers have had to manage throughout our professional careers."

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