Patent ID: 8668756

Claim:
A filter assembly comprising a housing having an inlet and an outlet, a panel filter element in said housing for filtering fluid flowing from said inlet to said outlet, said panel filter element dividing said housing into an inlet plenum and an outlet plenum, said panel filter element being configured to: a) reduce inlet flow restriction from said inlet, to said inlet plenum; and b) reduce outlet flow restriction from said outlet plenum to said outlet, wherein fluid flows along an axial direction in at least one of said inlet and outlet plenums, and flows transversely through said panel filter element from said inlet plenum to said outlet plenum, said inlet plenum and said outlet plenum are transversely spaced on opposite sides of said panel filter element therebetween, wherein said panel filter element extends obliquely relative to said axial direction, and wherein the volume of said inlet plenum increases as fluid progresses away from said inlet, and the volume of said outlet plenum decreases as fluid progresses towards said outlet.