46 C.F.R. § 32.56-21 Openings in exterior boundaries: Accommodation, service, and control spaces—T/ALL.
Title 46 - Shipping
The following exterior boundaries of accommodation, service, and control spaces, except wheelhouses, must have no openings, and portlights must be of a fixed type with easily operable steel covers on the inside: (a) The exterior boundaries that face the cargo area. (b) The portion of the exterior boundaries within 3 meters (10 feet) or the length of the vessel divided by 25, whichever is greater, except that the distance need not exceed 5 meters (16.4 feet), of these boundaries.
Title 46: Shipping
PART 32—SPECIAL EQUIPMENT, MACHINERY, AND HULL REQUIREMENTS
Subpart 32.56—Structural Fire Protection for Tank Ships With a Keel Laying Date On or After January 1, 1975
§ 32.56-21 Openings in exterior boundaries: Accommodation, service, and control spaces—T/ALL.
