Patent ID: 8852307
Filing Date: 2014-10-07
Classification: B01D,F24C,Y10S

Abstract:
1. A filter unit comprising: a housing having an upstream side, a downstream side, and a cavity therebetween; a heat exchanger disposed within the cavity, the heat exchanger comprising at least two parallel tubes; at least a first entrance aperture disposed on the upstream side of the housing and defined by at least a first fin; at least a first baffle disposed on the downstream side of the housing so as to be oppositely disposed from the first entrance aperture; and at least a first exit aperture disposed on the downstream side of the housing adjacent the first baffle; wherein the first baffle and the first fin define at least one S-shaped flow path through the housing between the first entrance aperture and the first exit aperture, and the flow path routes a majority of air that enters the upstream side of the housing through the first entrance aperture around a downstream side of a first of the at least two parallel tubes, then between the first baffle and the first fin, and then around an upstream side of a second of the at least two parallel tubes, wherein the S-shaped flow path promotes removal of grease and oil particulates from the air and inhibits the passage of a flame through the housing; wherein the housing comprises a base and a cover that define the cavity, the base comprises a substantially planar base wall having a base wall perimeter and a plurality of lateral sidewalls coupled to the base wall perimeter and surrounding the cavity, the first entrance aperture is through the base wall, and the base further comprises the first fin and a second fin each extending partially across the at least one entrance aperture into the cavity at an oblique angle relative to the base wall.