For a boat with space considerations, a premade scuba specific unit would be the only thing that makes sense.Thanks, I was asking because carrying O2 on a boat for multi day trips was always problematic. You either carry a lot of weight and use a lot of floorspace for Ts or cut back to leaner mixes or fewer dives with nitrox.
Most of the boats I was on used roughly 9cfm compressors so would need about 20-30 LPM by my math to get 28 to 36%