DONALDSON RECEIVES CARB VERIFICATION EXTENSION FOR LXF MUFFLER FOR SELECT LOW NOx ENGINES

MINNEAPOLIS, MN – September 7, 2010 –Donaldson Company (NYSE:DCI), a leading worldwide manufacturer of filtration systems and parts, announced today that the California Air Resources Board (ARB) has extended the previously verified Donaldson Low NOx Filter (LXF) Muffler to cover newer year diesel engines (2002-2006) originally equipped with oxidation catalysts. The extension added engine families between 100 and 600 hp with certified NOx emissions of less than 3.0 g/bhp-hr used in on-road vehicles.

"We're very pleased to receive the CARB verification extension of the LXF Muffler Systems," said Fred Schmidt, Director of Donaldson Retrofit Emissions. "The verification provides broad engine coverage for vehicles subject to the upcoming regulatory deadlines of the California Diesel Risk Reduction Program. Many of the newly-approved engines are popular in retrofit programs, especially on school buses, refuse trucks and municipal vehicles. Additionally, the LXF Muffler verification extension includes select Federal engines and allows the application of a 13" diameter DPF substrate for larger engines."

The LXF Muffler offers vehicle and fleet owners a best-in-class DPF (Diesel Particulate Filter) solution for vehicles with sufficient duty cycles to permit passive DPF regeneration. "This technology offers the lowest regeneration temperatures, expanding the application range," says Schmidt. "In addition, the LXF Muffler is a passively regenerated emissions device which is less complex, with lower installation costs compared to competitive actively-regenerated systems."

The Donaldson LXF Muffler is available through the Donaldson certified retrofit emissions dealer network. Certified dealers have the knowledge and training to help support fleet owners with their diesel engine retrofit projects and DPF cleaning services.

Specific engine families and conditions for which the LXF Muffler System has been approved can be found in the Executive Order on the CARB webpage at: http://www.arb.ca.gov/diesel/verdev/verdev.htm.
To learn more about Donaldson filtration technology for retrofit emissions solutions or to locate your local dealer, visit www.donaldson.com/emissions or contact the company at 866-675-2847.