Decomposition chamber for aftertreatment system

A decomposition chamber for an aftertreatment system, the decomposition chamber comprising:

• an inlet conduit configured to receive exhaust, the inlet conduit having an inlet conduit exit opening;
• a decomposition conduit coupled to the inlet conduit;
• an endcap coupled to the decomposition conduit;
• an injector coupled to the endcap and configured to provide reductant into the decomposition conduit along an injection axis;
• a guide swirl mixer coupled to the endcap such that at least a portion of the guide swirl mixer extends partially around the injection axis;
• and
• a baffle coupled to the endcap and separated from the guide swirl mixer such that:
• (i) at least a portion of the baffle extends around at least a portion of the guide swirl mixer;
• (ii) at least a portion of the baffle extends between the inlet conduit exit opening and at least a portion of the guide swirl mixer;
• and (iii) an inner surface of the baffle faces an outer surface of the guide swirl mixer.