Don't ask me. I have a slightly older boat and have vents on both sides that also has tubes the same as my blowers tubes but they aren't even attached to anything. Literally a vent with vent tubes going to nothing. I too would like an explanation.
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When I was a child, I used to talk as a child, think as a child, reason as a child; when I became a man, I put aside childish things.
1 Corinthians Chapter 13 - 11