I'm not sure you'll be happy with that, and I'm not even sure it's safe. With the A/C exhaust in the engine room you'll build up a lot of heat in there unless you leave the hatches open. A/Cs want fresh, cool air. Then there's the potential problem of gasoline vapors getting into the AC.
If you can install it so it gets its air from outside, you should be good.
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Willie
She's a tired old barge but she's paid for!
http://s71.photobucket.com/alb...p;current=ef324993.pbw