StacksVerified U.S. regulatory reference

46 CFR §32.56-22

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
If openings are fitted into the following exterior boundaries of any space other than an accommodation, service, or control space, the interior of the space must be insulated to “A-60” Class and the space must not provide access to any accommodation, service, or control space:
  1. (a)The exterior boundaries that face the cargo area.
  2. (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.