46 CFR 169.315 - Ventilation (other than machinery spaces).
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(a) All enclosed spaces within the vessel must be properly ventilated in a manner suitable for the purpose of the space.
(c) Living spaces must be ventilated by a mechanical system unless it can be shown that a natural system will provide adequate ventilation in all ordinary weather conditions. Provided that paragraph (a) of this section is satisfied, a vessel having only a natural ventilation system must satisfy the following: V/A≥1.4 where V is the total area of the vents in square inches and A is the product in square feet of the vessel's design waterline length times its maximum beam.
Title 46 published on 2014-10-01
no entries appear in the Federal Register after this date.