Dual element air filter

Claim 1

A dual filter for a contaminated air stream, the combination comprising: a base member including air outlet passage means disposed centrally thereof; a first generally cylindrical open ended filter upon said base member concentric with said outlet passage means, said first filter fabricated from foamed material adapted for oil-wetting to permit air passage therethrough while removing small dirt particles from the airstream, screen means positioned against and supporting said first filter downstream thereof, filter-locating means upon and acting at said base member to maintain said concentricity, a second generally cylindrical filter, including pleated paperlike filter element, positioned upon said base member concentrically surrounding said first filter in spaced relation thereto for preventing the passage of a major portion of small foreign particles therethrough, and second filter, including coarse metallic screen means enclosing said filter element, and adapted to permit the passage of air therethrough; cover attachment means fixed to and extending from said base member; a cover member retained by said cover attachment means, spaced from said base member, removably engaging with each of said filters and confining each of said filters between said cover member and said base member, and including a depending skirt member substantially encompassing the length as said filters and cooperating with said outer filter to define an air inlet to said dual filter.