46 C.F.R. § 45.151 Other openings.
Title 46 - Shipping
Each opening other than hatchways, machinery space openings, manholes, or flush scuttles— (a) In freeboard decks, must be protected by an enclosed superstructure or by a deckhouse or companionway that is equal in strength and weathertightness to an enclosed superstructure; or (b) In exposed superstructure decks or in the top of a deckhouse on freeboard decks that gives access to a space below the freeboard deck or a space within an enclosed superstructure, must be protected by a deckhouse or companionway.
Title 46: Shipping
PART 45—GREAT LAKES LOAD LINES
Subpart D—Conditions of Assignment
§ 45.151 Other openings.
