INBOARD GASOLINE BOATS VENTILATION SYSTEM INSTALL
If you brought your boat to me for this job, I'd install two 3" Rule 135 CFM in line blowers and send it through a 5"x10" louver or two 4"圆" vents. You can't have too much compartment ventilation. His formulas are just like mine, though his figures will be slightly lower. These formulas I've used for many years and are in line with Dave Geer's recommendations too. This would be 290 CFM (cubic feet per minute). The rule I use for minimum air flow (blowers) is HP times 3, then subtract 100. inches is way over the top for your engine, no disrespect Tunnels, though you can't go wrong with this much venting either. If you want to be overly cautious then add 10%, making the vent area 48 sq. The rule I use for minimum vent area is the HP divided by 3, which in your case is 44 sq. If your boat is a planning craft, you can arrange venting to do this naturally, without blowers, but you have to be at speed for it to work, meaning that in low speed or idling situations, compartment smells and fumes can leak into living spaces. so that air is always entering the compartment, but most importantly not escaping into living spaces, such as the cabin. What this does is suck air through the bilge, down behind ceilings, etc. A 3" or 4" in line blower drawing compartment air, typically aft and out the transom or aft deck through clam shells or louvers. The easy way to do this is with a blower that sucks air out of the compartment. Often it's best to negatively pressurize the engine compartment.
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