Ted: I don't think I've got that 24" above the water line for the lifts.....more like 16-18", limited by the veranda sole. Still, that's a lot more than I had for the genset when it was mounted under the galley, which needed an anti-siphon that went through the galley sole and looped under the fridge. For all practical purposes, the joint exhaust should work, and I envisioned the genset exhaust tubed into the top of the main exhaust, just as you described.
I've gone this far and to great expense for this swap. I'll do the two separate exhausts as recommended, but since both the main and the genset exhaust exit on the port side, it only makes sense to exit them easily to the port transom. Many boat owners complain about genset exhaust exits on one side or another, especially when they are rafting. I really dislike the idea of two separate exhausts on one side of the stern, but....
The reason ABYC "recommends" (is that better ) that genny exhaust not exit at the transom is due to the potential for CO poisoning for people on the swim platform. This standard was adapted after a USCG press release and a NIOSH investigation of generator related fatalities in house boats.
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