Abstract: A filter assembly comprises a frame and a filter media formed over the frame. The frame comprises a first frame component comprising a particular first end portion, and a second frame component comprising a certain first end portion. The particular first end portion of the first frame component interlocks with the certain first end portion of the second frame component. A filter assembly method comprises forming a frame by interlocking a particular first end of a first frame component with a certain first end of a second frame component, and forming filter media over the frame.

Abstract: A grease filter unit includes a frame assembly and a filter material. The frame assembly includes a front frame member and a back frame member, with the filter material held between the two frame members.

Abstract: An all natural filter assembly without toxic materials for use in an air filtration unit is provided. The filter assembly for use in an air filtration unit includes a support frame and a disposable grease filter disposed across said support frame. The disposable grease filter is formed of wool fiber coated with a bonding agent comprising a natural soy, whey and/or linseed solution. Also provided is a disposable grease filter blanket, which includes a wool fiber woven, non-woven or needle punched blanket coated with a bonding agent of a natural soy, whey and/or linseed solution. The filter blanket can be coated with approximately 0.3 grams to 2.0 grams of bonding agent per square meter of wool fiber.