in that this wall 132 is close to the transom 12 and above the swim platform 14 and is thus sheltered from most wave action an opening 148 is formed through the left wall 138 of the housing 17 and this opening 148 is surrounded by an elastomeric gasket 150 which effectively seals it to the blower outlet 151 of the generator 54 fig5 attached to the left side wall 138 is a cover plate 152 which effectively blocks the outlet 148 forcing the air to rise into the plenum area 154 and thence through an elongated slit 156 to the outside any splash water tending to enter the slit 156 will flow down in the space between the plate 152 and the wall 138 and will exit a drain opening 158 this too serves to prevent any substantial amount of water from entering the m g set enclosure to the point where it might result in engine or generator malfunction cooling air is drawn in through the inlet louvers 142 by the pumping action of the engine 39 cylinders as well as by an impeller or fan 160 secured to the lower portion of the generator 39 s drive shaft see fig3 the rotation of this impeller draws the cooling air through the louvers 162 formed in the generator housing 164 this air driven by the impeller 160 then passes through the blower output connection 151 which as mentioned is sealingly disposed within the opening 148 in the housing side wall 138 the equipment housing 17 is fabricated and reinforced such that it can support the weight of an adult person and hence can function as a step when ascending from the swim platform to the top of the transom upon entering the craft brine being corrosive to most.