Editing Engine room (section)

===Ventilation===
[[Image:SS Shieldhall engine room.jpg|thumb|Engine room of the {{SS|Shieldhall||6}}]]
If equipped with internal combustion or turbine engines, engine rooms employ some means of providing air for the operation of the engines and associated ventilation.  If individuals are normally present in these rooms, additional ventilation should be available to keep engine room temperatures to acceptable limits.  If personnel are not normally in the engine space, as in many pleasure boats, the ventilation need only be sufficient to supply the engines with intake air.   This would require an unrestricted hull opening of the same size as the intake area of the engine itself, assuming the hull opening is in the engine room itself.  Commonly, screens are placed over such openings and if this is done, 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.{{citation needed|date=October 2015}}