Donaldson Company to Present at Merrill Lynch Conference

MINNEAPOLIS, May 4, 2006 -- Donaldson Company, Inc. , today announced that Bill Cook, Chairman, President and Chief Executive Officer, will present at the Merrill Lynch Machinery Research 8th Global Industries Conference. The Merrill Lynch conference will take place in London on May 9 and 10. Cook will present at 9:10 a.m. London time (4:10 a.m. EDT) on Wednesday, May 10. A webcast of this presentation will be accessible in the Investors section of the Donaldson Company website http://www.donaldson.com/ .

About Donaldson Company, Inc.

Donaldson is a leading worldwide provider of filtration systems and replacement parts. Donaldson is a technology-driven company committed to satisfying customer needs for filtration solutions through innovative research and development. Donaldson serves 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 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 http://www.donaldson.com/ .