MINNEAPOLIS – June 8, 2009 – Donaldson Company (NYSE:DCI), a leading, worldwide manufacturer of filtration systems and parts, announces the new brand identity of the Aerospace and Defense Group. The Aerospace and Defense Group consolidated its existing brands -- Aerospace Filtration Systems (AFS), Le Bozec Filtration and Systems (Le Bozec), and Western Filter -- in order to provide a singular customer experience and expand the product offering available to customers.

"This decision was made to better distinguish Donaldson's Aerospace and Defense Group as a leader in filtration solutions. This change will allow for a united Aerospace and Defense Group and a singular customer experience. Collectively, we will now offer a full range of filtration for each aerospace and defense market segment," said Sheila Peyraud, General Manager of Aerospace and Defense at Donaldson Company.

As part of this initiative, AFS, Le Bozec and Western Filter will transition to the Donaldson brand. Aerospace Filtration Systems will continue to operate out of Saint Louis, MO and offer superior barrier filters for the rotorcraft industry. Le Bozec will continue to serve the European Aerospace and Defense market and maintain an office in Paris, France. Western Filter will continue to operate out of Valencia, CA and provide liquid filtration to the aerospace and defense industry.

The Donaldson Aerospace and Defense Group headquarters will remain in Minneapolis, MN. Current Donaldson customers will now be offered an extended product line due to this integration. Donaldson's Aerospace and Defense Group remains committed to providing quality products, reliable and prompt customer service and a broad range of filtration solutions for your organization.

For more information, visit the Donaldson Aerospace and Defense website at http://www.donaldson.aero or contact Donaldson at 1-866-323-0394 or 1-952-887-3435.

About Donaldson's Aerospace & Defense Group
Donaldson's Aerospace and Defense Group is a leading worldwide provider of filtration systems for the aerospace and defense industry. Our filtration solutions protect fixed wing aircraft, rotorcraft, military ground vehicles, electronic equipment, space vehicles, missiles, military shipboard systems and amphibious vehicles. We are committed to advancing filtration technology, providing quality products and prompt customer service. Our group serves customers from sales, engineering and manufacturing locations around the world.

About Donaldson Company
Donaldson Company, Inc. is a leading worldwide provider of filtration systems 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 filtration solutions through innovative research and development, application expertise, and global presence. Our employees contribute to the Company's success by supporting our Customers at our more than 100 sales, manufacturing, and distribution locations around the world.

Donaldson is a member of the S&P MidCap 400 and Russell 1000 indices, and our shares trade on the NYSE under the symbol DCI. Additional information is available at www.donaldson.com .

For More Information:
Mary Callahan +1 952-887-3034