KleenAir Systems Issued Patent on Sonic Flow Carburetor

    IRVINE, Calif.--Sept. 26, 2002--

Company's Patent-Protected Technology Well Fits Growing Government Regulations for Emission Control While Improving Fuel Efficiency

    KleenAir Systems, Inc.(OTC BB:KAIR) announced today that Lester P. Berriman, Chairman of the Board and John M. Zabsky, Vice President of Engineering have been issued received U.S. patent #6,446,940 B1 for their Fuel-Air Mixer to be marketed under the name of the "Sonic Flow Carburetor".
    This technology will significantly improve fuel efficiency while reducing Carbon Dioxide (CO2).
    The Sonic Flow Carburetor produces excellent: air/fuel mixture, air/fuel ration control, cylinder-to-cylinder distribution, lean misfire, low emissions and fuel savings of 5-20%.
    A unique application of the Sonic Flow Carburetor is as a dual fuel system for diesel engines. Using natural gas or propane fed into the engine in combination with the intake air and ignited by the injected diesel fuel (as little as 20% diesel is needed) results in reduced particulate matter and other exhaust emissions.
    The Sonic Flow Carburetor is a variable venturi operated under critical flow conditions. As a result the airflow through the throat is at sonic velocity and the conditions at the throat are a function of upstream conditions (atmospheric) and not downstream (manifold) conditions. The design of the venturi is such that the throat is maintained at sonic velocity over most of the engine's range of manifold vacuums and the ratio of vacuum at any position above the throat to the throat is constant. Thus fuel can be metered at any position above the throat and maintained at a constant Air/Fuel ratio. Therefore a simple float metering system or the vacuum signal can be used as part of a precise electronic metering system.
    Since the sonic velocity at the throat causes the fuel to be atomized to very small particles (about 20 microns) it results in a fine fog which flows uniformly to each cylinder enabling the engine to operate extremely efficiently at lean air fuel ratios. Tests have shown operations as lean as 30/1 with gasoline.
    KleenAir is dedicated to the development, testing, and commercialization of products designed to help eliminate smog and air pollution in the environment.
    KleenAir Systems, Inc. (KleenAir) is a NASDAQ OTCBB company trading under the symbol "KAIR" and is located in Irvine, California. Its web site is www.KAIR.com.

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