46 C.F.R. § 169.631 Separation of machinery and fuel tank spaces from accommodation spaces.
Title 46 - Shipping
(a) Machinery and fuel tank spaces must be separated from accommodation spaces by watertight or vapor tight bulkheads of double diagonal wood, marine plywood, steel plate, or equivalent construction. (b) On vessels less than 90 feet in length, segregation may be by means of a watertight or vapor tight engine box.
Title 46: Shipping
PART 169—SAILING SCHOOL VESSELS
Subpart 169.600—Machinery and Electrical
Ventilation
§ 169.631 Separation of machinery and fuel tank spaces from accommodation spaces.

