Abstract: An air filter kit for residential and light commercial air filtration applications including a user assembled, dimensionally adjustable, air filter frame assembly capable of telescopic adjustment of both length and width. Telescopic adjustment is facilitated by a plurality of slidably engaged frame members which together form an adjustable peripheral filter frame defining a recessed channel for receiving a quantity of filter media therein. Adjustment of the frame members is further facilitated by the use of a lubricating substance such as a friction reducing synthetic tape between the members. A quantity of spongy filter media is secured cut to size and secured within the recessed channel by a quantity of hook material projecting into the filter media. A perimeter gasket anchors the frame dimensions while providing a positive seal between the frame and a filter track.

Abstract: An air cleaner incorporating a plurality of filtration techniques within a rigid, gasketed frame designed to fit in conventional filter tracks. A perimeter gasket attached to the frame leaving air side provides a positive seal thereby preventing air from bypassing the frame. The frame houses, in series from the entering air side, a replaceable dry-type media filter coated on its leaving air side with a viscous substance, and a synthetic weave having a charge separation producing local electrostatic effects. The replaceable media effectively comprises two stages of filtration; dry-type media filtration, and viscous impingement filtration. Air passing through the instant filtration configuration is efficiently cleaned with little resistance.