46 C.F.R. § 169.745 Escape hatches and emergency exits.
Title 46 - Shipping
Each escape hatch and other emergency exit must be marked on both sides using at least 1-inch letters: “EMERGENCY EXIT, KEEP CLEAR”, unless the markings are deemed unnecessary by the Officer in Charge, Marine Inspection.
Title 46: Shipping
PART 169—SAILING SCHOOL VESSELS
Subpart 169.700—Vessel Control, Miscellaneous Systems, and Equipment
Markings
§ 169.745 Escape hatches and emergency exits.

