We have one on our boat and love it. It exhausts the cooling water beneath the boat and into the water. The exhaust air/gasses come out above the water line. If you're standing on the dock right next to where the exhaust gas comes out you can barely hear it (15KW Westerbeke diesel gen) and all you hear is a slight hum sound.
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Mike and Tina
1981 Boston Whaler 13'
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