POWER OF ATTORNEY







 KNOW ALL PERSONS BY THESE PRESENTS, that I, David W. Timm,

hereby constitute and appoint Norman C. Linnell, Amy C. Becker and

William M. Cook, and each of them, my true and lawful

attorneys-in-fact and agents, each acting alone, with full powers of

substitution and resubstitution, for me and in my name, place and

stead, to sign any reports on Form 3 (Initial Statement of Beneficial

Ownership of Securities), Form 4 (Statement of Changes in Beneficial

Ownership of Securities) and Form 5 (Annual Statement of Changes in

Beneficial Ownership) relating to transactions by me in Common Stock

or other securities of Donaldson Company, Inc., and all amendments

thereto, and to file the same, with the Securities and Exchange

Commission and the New York Stock Exchange, Inc., granting unto said

attorneys-in-fact and agents, and each of them, or their substitutes,

full power and authority to do and perform each and every act and

thing requisite or necessary to be done, as fully to all intents

and purposes as I might or could do in person,hereby ratifying and

confirming all that said attorneys-in-fact and agents, and each of

them, or their substitutes, may lawfully do or cause to be done by

virtue hereof.  This Power of Attorney shall be effective until such

time as I deliver a written revocation thereof to the above-named

attorneys-in-fact and agents.





Dated: December 5, 2006







David W. Timm

(signature)

David W. Timm