Donaldson Company's Advanced Aircraft Filters
Help Improve In-flight Experience for Boeing Passengers and Crew

MINNEAPOLIS - October 11, 2004 - Donaldson Company Inc. (NYSE: DCI) today announced OEM approval on a new HEPA cabin recirculation filter for the Boeing 767-400, 767-200ER and 767-300ER aircraft (Part #P512764). Donaldson also announced OEM approval on an In-Flight Entertainment (IFE) filter for the Boeing 767-200 and 777-300 aircraft (Part#1986000). Donaldson's new High-Efficiency Particulate Air (HEPA) Cabin-Air Recirculation Filters improve cabin air quality by filtering airborne contaminants such as bacteria, dust, lint, pollen and smoke. Similarly, Donaldson's new IFE filter can improve in-flight entertainment equipment reliability by capturing airborne contaminants that can damage sensitive electronic components.

"Airlines are always looking for cost-effective ways to improve the overall flight experience for passengers and crew," said Sheila Peyraud, general manager, Donaldson Company. "Our HEPA cabin filters and IFE filters satisfy this need, offering superior options for improving air-quality and the reliability of entertainment equipment on all types of aircraft."

Donaldson's HEPA Cabin Air Recirculation Filters offer improved particle removal efficiency and an advanced structural design for greater reliability and longer life. The P512764 exceeds Boeing specifications for Skydrol(tm) aerosol particulate removal.

Donaldson IFE filters are designed to improve equipment reliability and lifespans for in-flight entertainment systems. The IFE filter and housing is mounted directly onto a purser station's ventilation louver assembly using simple push-button fasteners. With an estimated element service life of 800 flight hours, the IFE filter housing and elements are designated for Boeing 777-200 and 767-300 airplanes and meet all Boeing and Federal Aviation Administration (FAA) performance and flammability requirements. Donaldson manufacturers a complete line of IFE filters for all Boeing aircraft.

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 2004, Donaldson reported sales of more than $1.4 billion and achieved its 15th consecutive record year. 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.

Skydrol is a trademark of Solutia Inc.

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