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I'm now planning on trying to install an Air Head on my boat, and forego the nightmare of trying to retrofit it with a holding tank. The only thing I need to worry about now is installing a vent.
I talked a little with Air Head support and they recommend using a 2 1/2" ventilation hose and thru-hull, the kind that usually has a vent cowl on it.
My boat already has one of these vent cowls for the engine compartment fan (only needed when there are gas fumes or the boat smells for some other reason). So I thought maybe I could combine the systems with a Y-connector and not have to drill any new holes through my hull, which would be really beneficial in that it will be less work, won't change the boat cosmetically, and won't be as permanent if I need to try something else.
Does this setup raise any red flags for anyone?
I think I can protect the engine (and my cabin) from backwash from the Air Head fan, by just placing a simple air valve in the engine vent hose. However I was also wondering where I might find a simple air valve like that. All the ones I can find online are for inflatable boats. If they made any that are threaded, or at least have tubed ends that I can clamp something onto, that'd work much better.
Or I guess there's always duct tape...
EDIT:
Sorry!! The problem has been solved.
I dunno how I could've been such a blockhead. I thought I only had one of these.
There's two. One on each side. And the starboard one doesn't even do anything. Pretty silly that I missed something so huge and obvious. In my defense, this is my first boat :]
I talked a little with Air Head support and they recommend using a 2 1/2" ventilation hose and thru-hull, the kind that usually has a vent cowl on it.
My boat already has one of these vent cowls for the engine compartment fan (only needed when there are gas fumes or the boat smells for some other reason). So I thought maybe I could combine the systems with a Y-connector and not have to drill any new holes through my hull, which would be really beneficial in that it will be less work, won't change the boat cosmetically, and won't be as permanent if I need to try something else.

Does this setup raise any red flags for anyone?
I think I can protect the engine (and my cabin) from backwash from the Air Head fan, by just placing a simple air valve in the engine vent hose. However I was also wondering where I might find a simple air valve like that. All the ones I can find online are for inflatable boats. If they made any that are threaded, or at least have tubed ends that I can clamp something onto, that'd work much better.
Or I guess there's always duct tape...
EDIT:
Sorry!! The problem has been solved.
I dunno how I could've been such a blockhead. I thought I only had one of these.

There's two. One on each side. And the starboard one doesn't even do anything. Pretty silly that I missed something so huge and obvious. In my defense, this is my first boat :]