Patent ID: 8756923

Claim:
An apparatus for treating exhaust, comprising: a housing having a side wall, a top wall, and a bottom wall, the housing having an inlet and an outlet, the inlet in fluid communication with a source of exhaust gas; a mixing chamber in the housing in fluid communication with the inlet; a substrate chamber in the housing in fluid communication with the mixing chamber; an outlet chamber in the housing in fluid communication with the substrate chamber and the outlet; and a mixing loop comprising: a first branch having a first proximal end connected to the inlet and extending into the mixing chamber; a second branch having a second proximal end connected to the inlet and extending into the mixing chamber, wherein a plurality of apertures is defined in respective walls of the first branch and the second branch; and an end section extending between respective distal ends of the first branch and the second branch, wherein the end section is devoid of apertures and closed to block the exhaust gas from being expelled through the end section and into the mixing chamber, and wherein the end section is curved and forms a 180 degree turn.