Section 111.103-3 - Machinery space ventilation(a) Each power ventilation system for a machinery space must have two controls to stop the ventilation, one of which may be the supply circuit breaker.(b) The controls required in paragraph (a) of this section must be grouped so that they are operable from two positions, one of which must be outside the machinery space.CGD 74-125A, 47 FR 15236, Apr. 8, 1982, as amended by USCG-2020-0075, 88 FR 16365 , Mar. 16, 2023