Emissions cleaning module

An emissions cleaning module for removing emissions from an exhaust gas, comprising:

• a first support;
• a second support, wherein the first support and the second support are generally planar and parallel to each other;
• a mixer module comprising a first end and a second end, the mixer module extending between the first support and the second support;
• wherein the mixer module comprises:
• a generally cylindrical outer body comprising a first end and a second end and having a generally constant diameter between the first and second ends;
• a generally cylindrical inner body comprising a first end and a second end, the inner body being located within the outer body, the outer body and inner body defining an air gap therebetween, the air gap extending generally along an entire length of the inner body, the outer body and the inner body being arranged concentrically between the first and the second support;
• the first end of the outer body is fixedly retained to the first support and the second support of the outer body is fixedly retained to the second support;
• the first end of the inner body is slidingly retained within the outer body to compensate for expansion and contraction of the inner body, an overlap between the first end of the inner body and the first end of the outer body prevents opening of the air gap during expansion and contraction of the inner body;
• the second end of the inner body is fixedly retained relative to the outer body at or near the second support;
• at least one fluid treatment module located upstream of the mixer module and comprising an end coupling fluidly connecting an output of the at least one fluid treatment module with an inlet of the mixer module, wherein the at least one fluid treatment module extends between the first support and the second support;
• and
• a urea injector module upstream of the mixer module and disposed on a fluid flow coupling, the fluid flow coupling being disposed on one of the first support and the second support and defining a portion of a path of the exhaust gas entering the inner body of the mixer module.