Abstract: A high efficiency particulate air filter, and a method of fabricating the same, are disclosed, with the filter being characterized by being lightweight and readily disposable after use. Further, the filter may be fabricated in a basic or universal form, which permits it to be utilized to form any one of a number of possible specific mounting configurations by the placement of one or more specifically designed headers about the outer periphery. The filter comprises a sheet of HEPA filtering media folded upon itself in accordion fashion to form a filter pack, and a relatively thin and lightweight peripheral frame surrounding and supporting the pack. The frame is composed of a relatively hard, crust-like, air impermeable molded material which is self-bonded and sealed to the filter pack to effectively preclude the leakage of air therebetween.

Abstract: A high efficiency particulate air filter is disclosed which comprises a frame surrounding and sealably supporting the filter pack, with the frame composed of four separate side panels which are rigidly interconnected at their abutting ends by means of corner plates. The corner plates are in the form of two flanges disposed at right angles to each other, and the flanges are closely received within slots formed on the outer face of the side panels. The corner plates preferably extend across the entire width of the side panels of the frame to impart substantial rigidity to the frame, and a sealing material is disposed in a recess which extends along the bight of the corner plates to provide a continuous seal along the abutting ends of the side panels.