Donaldson Comapny, Inc.

Bryan D Patten

Wayne M Wagner

Gary Ray Gillingham

Gregory L Reichter

Joseph C Tokar

Daniel T Risch

Fred H Wahlquist

Jim C Rothman

Bernard A Matthys

Stephen Sabelko

Fluted filter media includes filter material having a plurality of flutes formed therein having alternating ends of adjacent flutes closed to force fluid through filter material. A first embodiment of the filter media includes tapered flutes which have the open ends of the flutes larger in cross-section than the closed flutes, wherein the upstream open flutes converge toward the downstream end and the upstream closed end flutes diverge toward the downstream end. A second embodiment includes filter media which is asymmetric formed with dissimilar upstream and downstream flute cross-sections with larger flute openings to the upstream side of the filter. A third embodiment includes filter media with an upstream edge crushed to improve flow at the upstream edge. A fourth embodiment includes filter media with the upstream sealing material recessed from the upstream edge for reducing effects from blockages at the upstream edge of the filter.

Fluted filter media

Method of making a fluted filter media for air filter

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Bloomington, MN, United States of America

Bryan D Patten