airflow is reduced by approximately 50%, so the opening area is increased appropriately. The requirement for general ventilation and the requirement for sufficient combustion air are quite different. A typical arrangement might be to make the opening large enough to provide intake air plus 1000 Cubic Feet per Minute (CFM) for additional ventilation. Engines pull sufficient air into the engine room for their own operation. However, additional airflow for ventilation usually requires intake and exhaust blowers. History Engine rooms were separated from its associated fire room on fighting ships from the 1880s through the 1960s. If either experienced damage putting it out of action, the associated engine room could get steam from another fire room. See also Engine department Marine propulsion Marine fuel management Mechanical room Electrical room Fire room Marine Engineers Network Ship compartments Marine propulsion