Ventilation

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See Professional Boatbuilder #109/110 'Venting the boat'. For Enginerooms see also the Perkins manual.


  • Speed on outside grills - 4-5 m/s maximum (for other situations see list of MS)


Volume Change Rate[edit]

Compartment VCR per houre (# of times) Time to change (minutes)
Galley 10-20 3-6
Bathrooms and toilets 8-10 5-7
Sleeping cabins 6-8 7-10
Saloons 5-10 7-12
Forepeaks and lazarettes 5 12
Bilges 5 12
Storage areas 8-12 5-7
Machinery spaces 150-250* 0.24-0.40*
Battery compartments * *


Air Per Person[edit]

Rod Stephen's Rule[edit]

Rule of thumb for a single deck vessel:

Total vent area (cm2) = 70 x WL (m) x LOA (m)