Donaldson Comapny, Inc.

James K Elfstrand

Larry R Nepsund

Thomas A Boeckermann

Kathleen A Abrahamson

Steven Alan Carter

Rocco A DePietro, Iii

An improved air cleaner arrangement is provided. The preferred air cleaner is wedge shaped, and is constructed as a &ldquo;no-housing&rdquo; arrangement. The arrangement includes first and second end caps, with pleated media extending therebetween. The preferred arrangement includes an angled mounting flange, for mounting beneath the hood of a vehicle.

Air cleaner; method and use

An improved air cleaner arrangement is provided. The preferred air cleaner is wedge shaped, and is constructed as a 'no-housing' arrangement. The arrangement includes first and second end caps, with pleated media extending therebetween. The preferred arrangement includes an angled mounting flange, for mounting beneath the hood of a vehicle.

A filter arrangement is provided. The filter arrangement generally includes an air filter having an upstream surface with a prefilter positioned thereon. The prefilter preferably include at least two layers of depth media. In preferred systems, the prefilter includes two layers of depth media secured to one another by stitching. In certain preferred arrangements disclosed, the prefilter include an upstream layer of fibrous depth media and a downstream layer of foam depth media, with the two layers stitched to one another along peripheral edges. The invention also concerns provision of prefilters, and also air filter arrangements which include housings having air filters with prefilters according to the present invention operably positioned therein. Methods of construction and use are also provided.

Method of servicing an air cleaner and of filtering engine intake air

Air cleaner

Filter element having circular sleeve

Filter sleeve

A filter arrangement is provided. The filter arrangement generally includes an air filter having an upstream surface with a prefilter positioned thereon. The prefilter preferably includes at least two layers of depth media. In preferred systems, the prefilter includes two layers of depth media secured to one another by stitching. In certain preferred arrangements disclosed, the prefilter includes an upstream layer of fibrous depth media and a downstream layer of foam depth media, with the two layers stitched to one another along peripheral edges. The invention also concerns provision of prefilters, and also air filter arrangements which include housings having air filters with prefilters according to the present invention operably positioned therein. Methods of construction and use are also provided.

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Mounds View, MN, United States of America

James K Elfstrand