An emissions cleaning module comprising an upstream conduit, a downstream conduit and a flowhood the flowhood comprising: a first section and a second section, wherein the second section comprises a first aperture for connection to the upstream conduit and a second aperture for connection to the downstream conduit. the emissions cleaning module further comprising a mixer and wherein the flowhood comprises one or more deflectors (510, 520) for directing a flow of exhaust gas that reaches the mixer to flow over and around at least a part of a circumference of an elongate body of the mixer rather than initially impacting the elongate body in a perpendicular orientation; wherein at least a portion of the one or more deflectors (510, 520) is concentrically arranged relative to the mixer to so define a part-annular void space between the one or more deflectors and the elongate body; wherein the one or more deflectors (510, 520) comprises a first deflector and a second deflector; characterised in that: the one or more deflectors (510, 520) are located upstream of, and physically spaced from, the elongate body of the mixer the second deflector is located upstream of the first deflector so as to define a tortuous path between the second deflector and the first deflector; and wherein the tortuous path is configured to create, in use, a swirling flow of exhaust gas that revolves around a circumference of the elongate body of the mixer. a first section and a second section, wherein the second section comprises a first aperture for connection to the upstream conduit and a second aperture for connection to the downstream conduit. the emissions cleaning module further comprising a mixer and wherein the flowhood comprises one or more deflectors (510, 520) for directing a flow of exhaust gas that reaches the mixer to flow over and around at least a part of a circumference of an elongate body of the mixer rather than initially impacting the elongate body in a perpendicular orientation; wherein at least a portion of the one or more deflectors (510, 520) is concentrically arranged relative to the mixer to so define a part-annular void space between the one or more deflectors and the elongate body; wherein the one or more deflectors (510, 520) comprises a first deflector and a second deflector; characterised in that: the one or more deflectors (510, 520) are located upstream of, and physically spaced from, the elongate body of the mixer the second deflector is located upstream of the first deflector so as to define a tortuous path between the second deflector and the first deflector; and wherein the tortuous path is configured to create, in use, a swirling flow of exhaust gas that revolves around a circumference of the elongate body of the mixer. the one or more deflectors (510, 520) are located upstream of, and physically spaced from, the elongate body of the mixer the second deflector is located upstream of the first deflector so as to define a tortuous path between the second deflector and the first deflector; and wherein the tortuous path is configured to create, in use, a swirling flow of exhaust gas that revolves around a circumference of the elongate body of the mixer.