FROM:
The Carideo Group Inc.
1250 One Financial Plaza
120 South Sixth Street
Minneapolis, Minnesota 55415
FOR:
Donaldson Company, Inc.
P.O. Box 1299
Minneapolis, Minnesota 55440
(NYSE: DCI)

CONTACTS:
Jan W. Drymon
(612) 317-2881
E-mail: jan@carideogroup.com
Janice Kovala
(866) 484-8329
E-mail: jkovala@mail.donaldson.com

FOR IMMEDIATE RELEASE

DONALDSON EARNS LEVEL 3 CALIFORNIA VERIFICATION FOR 1994-2006 DIESEL ENGINES
Air Resources Board Has Verified Its Diesel Particulate Matter Low Temperature Filter (Ltf) Muffler With Or Without Spiracle™ Closed Crankcase Filtration System

MINNEAPOLIS, October 24 - Donaldson Company, Inc., a leading manufacturer of filter systems and replacement parts, today announced that the California Environmental Protection Agency's Air Resources Board (ARB) has verified the company's diesel particulate matter low temperature filter (LTF) muffler for 1994-2006 model year non-EGR diesel engines used in on-road applications operating on ultra low sulfur diesel fuel. With the CARB verification, this product is acknowledged to provide particulate matter (PM) reductions by at least 85%, qualifying it as an ARB Level 3 device.

"Donaldson is proud to receive this verification from ARB," said Fred Schmidt, Director of Sales – Emissions Group at Donaldson. "The Level 3 verification of the LTF muffler complements our retrofit product line, providing our customers a wider selection of products to meet the ARB diesel reduction requirements. The Donaldson LTF muffler, used with or without the patented Spiracle crankcase filter system, utilizes a durable, patent pending design to effectively reduce particulate matter emissions."

The LTF muffler basic design is a flow-through filter followed by a wall flow diesel particulate filter and a backpressure monitor. The Spiracle crankcase filtration system can be included to eliminate emissions from the crankcase and reduces in-cabin emissions. Donaldson recommends the LTF muffler for light duty vehicle operating conditions with low exhaust temperatures.

The ARB's Diesel Risk Reduction Plan requires that all existing vehicles and engines be evaluated and, wherever technically feasible and cost-effective, retrofitted, repowered, refueled or replaced to reduce diesel PM emissions. This product also meets the requirements of the EPA's Voluntary Retrofit Program.

As a result of EPA CARB Verification Reciprocity, this product is available for air quality improvement initiatives across the country. For more information about Donaldson's LTF and Spiracle filter products contact Donaldson at 866-675-2847.

About Donaldson Company, Inc.

Donaldson is a leading worldwide provider of filtration systems and replacement parts. We are a technology-driven company committed to satisfying our customers needs for filtration solutions through innovative research and development. We serve customers in the diesel engine and industrial markets including in-plant air cleaning, compressed air and gas purification, power generation, disk drive filtration, off-road equipment and on-road trucks. Our 11,000 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 NYSE under the symbol DCI. Additional company information is available at www.donaldson.com.

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