Marine Ventilation Calculator

Calculate required ventilation for marine compartments per ABYC standards

Internal volume of the space requiring ventilation. Measure length x width x height of the compartment.
cu ft
Engine rooms require the most ventilation (for combustion air and heat removal). Battery compartments need ventilation to clear hydrogen gas.
Total installed horsepower for engine room ventilation. Diesel engines require approximately 2.5 CFM per HP for combustion air plus cooling air.
HP

Results

Required CFMCFM
Duct Size
Fan CapacityCFM
Air Changes per HourACH
Vent Area Neededsq in
References: ABYC H-32 (Ventilation), USCG 33 CFR 183. Engine rooms: min 20 air changes/hour. Battery compartments: min 12 ACH to clear hydrogen. Accommodation: 10-15 ACH for comfort.