Donaldson Membrane Introduces Tetratex 7018 1

IVYLAND, PA – September 15 –Donaldson Membranes, a division of Donaldson Company (NYSE:DCI), a leading, worldwide manufacturer of filtration systems and parts, will showcase Tetratex® 7018, a new product development for its Tetratex® brand of Expanded PTFE membrane roll goods for industrial filtration applications, at the Filtration 2008 Show (Booth #512) to be held in Philadelphia, Pennsylvania, December 9-11, 2008.

Tetratex 7018 is a white, 20 ounce ePTFE membrane utilized in a host of high-end filtration baghouse process applications for air pollution control and product recovery such as:

Ti O₂ - oxidizers, chlorinators, dryers, micronizers,

Medical and hazardous specialty incineration,

Lead - smelters, dryers,

Catalysts and others.

It is currently being used in a Ti0₂ and micronizer applications where it has been very well received in the market.

Donaldson representatives will be on hand to discuss benefits of Tetratex 7018 and other Tetratex ePTFE membranes at Filtration 2008. For more information on Donaldson Tetratex filtration technology visit the company’s website at www.tetratex.com or contact Donaldson Membranes at (215) 396-8349 or membranes@mail.donaldson.com.

About Donaldson Company, Inc.

Donaldson is a leading worldwide provider of air and liquid filtration systems and replacement parts that improve people’s lives, enhance our Customers’ equipment performance and protect our environment. We are a technology-driven company committed to satisfying our Customers’ needs for industrial filtration solutions through innovative research and development, superior technology and global presence. Our 12,000 employees contribute to the company’s success by supporting our Customers at more than 100 sales, manufacturing, and distribution locations around the world.

Donaldson is a member of the S&P MidCap 400 Index, and Donaldson shares are traded on the NYSE under the symbol DCI. Additional company information is available at www.donaldson.com.