(b) Each penetration of, and each opening in, a bulkhead in a machinery space must—

1. (1) Be kept as high and as far inboard as practicable; and
2. (2) Except as provided by § 174.210 of this subpart and by paragraph (c) of this section, have means to make it watertight.

(c) No penetration of a bulkhead in a machinery space by a ventilation duct need have means to make the bulkhead watertight if—

1. (1) Every part of the duct is at least 760 millimeter (30 inches) from the side of the OSV; and
2. (2) The duct is continuously watertight from the penetration to the main deck.