Patent ID: 8728189

Claim:
A filter unit comprising: a housing including a cavity; a heat exchanger disposed substantially within the cavity; at least one entrance aperture provided through the housing on an upstream side of the heat exchanger; at least one baffle provided on the housing on a downstream side of the heat exchanger, the downstream side being oppositely disposed of the upstream side; at least one exit aperture provided through the housing on the downstream side of the heat exchanger; wherein the at least one baffle is aligned with the at least one entrance aperture, such that when a gas is drawn through the at least one entrance aperture and across the heat exchanger, the baffle redirects the gas towards the heat exchanger prior to the gas leaving the cavity through the at least one exit aperture; wherein the housing comprises a base and a cover; wherein the base comprises: a substantially planar base wall having a base wall perimeter; a plurality of lateral sidewalls coupled to the base wall perimeter, the plurality of lateral side walls substantially encircling the base cavity; wherein the at least one entrance aperture is formed through the base wall; and wherein the base comprises a pair of fin members extending partially across each entrance aperture into the cavity at an oblique angle relative to the base wall.