Testing Shows Aircraft Engine Filters with Synthetic Media
Reduce Airflow Restriction and Iimprove Engine Performance

MINNEAPOLIS - May 10, 2005 - Donaldson Company Inc. (NYSE: DCI) announced that extensive product testing confirms the high performance and long-term durability of its aircraft engine intake filters with synthetic media. Tests recently conducted at the company's laboratories in Bloomington, Minn., following ISO 5011, demonstrated Donaldson aircraft filters with synthetic media have significantly improved airflow and restriction rates compared to the competing foam and gauze filters on the market today.

Test data shows that less dust passes through engines using Donaldson's synthetic pleated-media filters, providing increase airflow and the ability to better protect engine components from harmful contaminants, which can improve engine performance.

More information can be found at the following link: http://www.donaldson.com/en/aircraft/support/datalibrary/007217.pdf

Donaldson offers more than 50 engine air filter models designed to meet exact manufacturers' specifications for Beech, Cessna, Maule, Mooney, Piper and other aircraft. For more information on Donaldson's aircraft engine air-intake filters, please contact Donaldson at 952-887-3435 or visit http://www.donaldson.aero/

About Donaldson Company Inc.

Donaldson Company Inc. 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 in-plant air cleaning, compressed air and gas purification, power generation, disk drive filtration, off-road equipment and trucks. Our 10,000 employees contribute to the company's success at over 30 manufacturing locations around the world. 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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