Donaldson Company Selected to Present at
10th Annual Diesel Engine Emissions Reduction Conference

Donaldson representatives will highlight innovative techniques for reducing emissions

MINNEAPOLIS - Aug. 23 - Leading emissions experts from Donaldson Company Inc., (NYSE: DCI) will present strategies and techniques for reducing emissions at the 10th annual Diesel Engine Emission Reduction(DEER) conference. DEER is a symposium for the diesel engine industry sponsored by the U.S. Department of Energy.
Donaldson's two presentations will review new techniques and strategies for best managing Diesel Particulate Filter (DPF) regeneration - the process of removing the combustible portion of collected soot from diesel-particulate filters, which reduces harmful emissions.

The first presentation, "Development of an Active Regeneration Diesel Particulate System," introduces Donaldson's new exhaust emission control system. The second presentation, "A New Computational Fluid Dynamics Model for Understanding and Managing Diesel Particulate Filter Regeneration," highlights recent Donaldson advancements in the analytical modeling of regeneration.

"The DEER conference is unique for our industry because it invites representatives from a diverse range of sectors related to diesel engines to meet and share essential knowledge and strategies for further improving the
economics and environmental impact of diesel engines," said Ted Angelo, director of emissions product development, Donaldson Company. "The conference attracts some of the best researchers and strategists in the
industry with attendees from leading universities, government agencies and diesel-engine manufacturers. This is a unique opportunity to participate in the conference alongside leading experts from around the nation and showcase Donaldson's new Active Regeneration Diesel Particulate Filter System. This important new system technology will operate where passive DPF systems will not, thus greatly expanding the application of high-efficiency DPFs to a broad range of diesel engine applications."

The DEER conference focuses on new developments in diesel engine research, advances in the understanding of the combustion process and important studies on the impact of emissions on the environment. The conference
will be held Aug. 29 through Sept. 2 at the Loews Coronado Bay Resort near San Diego, Calif.

For more information on the DEER conference or to view a full agenda of participants, visit the conference's Web site at www.orau.gov/deer

About Donaldson Company
Donaldson Company, Inc., headquartered in Minneapolis, is a leading worldwide provider of filtration systems and replacement parts. Founded in 1915, Donaldson is a technology-driven company committed to satisfying
customer needs for filtration solutions through innovative research and development. Donaldson serves customers in the industrial and engine markets including dust collection, power generation, specialty filtration, compressed air purification, off-road equipment, industrial compressors, and trucks.

Our 10,000 employees contribute to the company's success at over 30 manufacturing locations around the world. In fiscal year 2003, Donaldson
reported sales of more than $1.2 billion and achieved its 14th consecutive year of double-digit earnings growth. Donaldson is a member of the S&P MidCap 400 Index, and Donaldson shares are traded on the New York Stock Exchange under the symbol DCI. Additional company information is available at www.donaldson.com

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