Donaldson Comapny, Inc.

Kirk A Schneider

Andrew J Dallas

Stanley B Miller, Iii

Paul L Kojetin

Katsushi Isogawa

Cynthia D Bellefeuille

Suzan K Nunnink

Henry J Drasner, Iii

Allan L Liebrenz

Daniel Eric Adamek

James R Scott

Jarren B Mills

Donald D Gronholz

Scott A Keller

Terrance D Feddersen

Todd G Carey

David G Ferris

An air filter assembly for removing particulate contaminants, chemical contaminants, biological contaminants, or any combination thereof, from airplane cabin air. The filter assembly is lightweight and compact in size. Minimal clearance is needed in order to remove and replace the filter element.

Air filtering system having easily removable and replaceable filter element, and methods

An air cleaner arrangement useful for cleaning air in ablative thermal imaging processes includes a housing and a removable and replaceable element assembly. The housing has an interior, an inlet conduit, and an outlet conduit. The element assembly includes first and second filter elements axially aligned and secured together in a stack configuration. The first filter element has a media pack for filtering particulate material. The second filter element has a media pack for filtering noxious gases, such as formaldehyde. In operation, a blower assembly directs airflow through the inlet conduit, into the first element interior, through the first element media pack, through the second element media pack, into the second element interior, and out through the housing outlet conduit. Methods for filtering and changing out of the element assembly are also described herein.

Stack filter assembly and methods

A filter is provided which includes an organic vapor adsorbing layer, a first particulate removal layer, and a second particulate removal layer. The organic vapor adsorbing layer includes porous adsorbent beads which allow air or gas to flow therethrough with little resistance and provide increased surface area by virtue of the pores. The particulate removal layer can be made from an electrostatic and/or polytetraflouroethylene. The filter can have a figure of merit greater than about 10 and a capacity for permanently adsorbing organic vapors, wherein the figure of merit is calculated based upon a fractional efficiency determined for particles having a size of 0.3 .mu.m in an air flow having a velocity of 10.5 ft./min and for Frazier permeability at 0.5 inches H.sub.2 O.

Filter and method for making a filter

The present invention is directed to a device (50) for providing filtration of air. The device includes a body (70) and a cover (72) with each having endless mating structure (76) and (78) which may be welded together thereby mechanically pinching a flat sheet filter media (74) and holding it in place. The cut edge of the filter media (74) is encapsulated. The filter media (74) is held outwardly from bottom (92) of body (70) by gussets (90) to provide sufficient area for air to pass through. Inlet openings (110) are provided between top (94) and endless mating structure (78) in a fashion which allows top (94) to be attached to a flat wall of a sealed housing of a type used for disk drive systems.

Air filter device

Growing community of inventors

Eden Prairie, MN, United States of America

Kirk A Schneider