Patent ID: 8945263
Filing Date: 2015-02-03
Classification: B01D,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 one baffle disposed on the downstream side of the housing so as to be oppositely disposed from the first entrance aperture; at least a first exit aperture disposed on the downstream side of the housing adjacent the at least a 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 before routing the air out of the downstream side of the housing through the first exit aperture, 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; a plurality of additional entrance apertures defined by a plurality of additional fins disposed on the upstream side of the housing and a plurality of additional exit apertures defined by a plurality of additional baffles disposed on the downstream side of the housing, wherein the plurality of additional fins and the plurality of additional baffles define a plurality of additional S-shaped flow paths through the housing; and wherein at least two of the plurality of additional fins are disposed laterally from each other on opposite sides of one of the plurality of additional entrance apertures, two of the additional S-shaped flow paths originate at the one of the plurality of additional entrance apertures, and the two of the additional S-shaped flow paths separate to flow downstream through two of the additional exit apertures.