46 CFR §108.151

1. (a)Each of the following must have at least 2 means of escape:
   1. (1)Each accommodation space with a deck area of at least 27 sq. meters (300 sq. ft.).
   2. (2)Each space, other than an accommodation space, that is continuously manned or used on a regular working basis except for routine security checks.
   3. (3)Weather deck areas where personnel may be normally employed.
2. (b)When two means of escape are required from a space below the main deck, one of the means of escape must provide for a rapid escape through openings that are not required to be watertight by damage stability considerations.
3. (c)When two means of escape are required from a space above the main deck, one of the means of escape must provide for a rapid escape to a weather deck.