A containerised generator set 1 comprises a generator 10 arranged within a container 2 having a first aperture 30 through which cooling air E is exhausted in use, a pair of first doors 40 are arranged to pivot outwardly on either side of the first aperture 30, with a removable wall 50 being removably mounted between the first doors and spaced apart from the body 20 of the container 2 by the first doors 40 from its lower end region (51, Fig. 3) to its upper end region (52, Fig. 3) in its mounted position, the removable wall 50 and the first doors 40 define an exhaust air duct 70 which preferably includes a sound absorbent material (90, Fig 3), the exhaust air duct 70 extends for at least most of a total height of the body 20 of the container to attenuate noise from the generator 10, exhausted cooling air E flows upwardly from the open upper end of the exhaust air duct 70 and away from the immediate operating environment.
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