Patent ID: 8007555

Claim:
A panel air filter assembly for use in heat, ventilating and air conditioning (HVAC) systems, said filter assembly comprising: a multi-sectioned filter element of fibrous material having a first sectioned filter portion, a second sectioned filter portion, a third sectioned filter portion and a fourth sectioned filter portion; said first sectioned filter portion being adjacently positioned in a side-by-side relationship to said second sectioned filter portion so that the engagement between edges of said first sectioned filter portion and edges of said second sectioned filter portion lacks any discernable gaps; said second sectioned filter portion being adjacently positioned in a side-by-side relationship to said third sectioned filter portion so that the engagement between the edges of said second sectioned filter portion and edges of said third sectioned filter portion lacks any discernable gaps; said third sectioned filter portion being adjacently positioned in a side-by-side relationship to said fourth sectioned filter portion so that the engagement between the edges of said third sectioned filter portion and edges of said fourth sectioned filter portion lacks any discernable gaps; a substantially rectangular frame, said frame securely supporting said filter element at its marginal edges; each of said first through fourth sectioned filter portions being of substantially equal dimensions; and each of said first through fourth sectioned filter portions being formed of a single layer of a specific type of medium which is distinct from one another so as to remove different types of contaminants from outdoor supply air before entering occupied spaces of buildings via the HVAC systems.