46 CFR 177.600 - Ventilation of enclosed and partially enclosed spaces.
(b) A power ventilation system must be capable of being shut down from the pilot house.
(c) An enclosed passenger or crew accommodation space and any other space occupied by a crew member on a regular basis must be ventilated by a power ventilation system unless natural ventilation in all ordinary weather conditions is satisfactory to the OCMI.
(d) An exhaust duct over a frying vat or a grill must be of at least 11 U.S. Standard Gauge steel.
(e) Combustibles and other foreign materials are not allowed within ventilation ducts. However, metal piping and electrical wiring installed in a metal protective enclosure may be installed within ventilation ducts, provided that the piping or the wiring does not interfere with the operation of fire dampers. Electrical wiring and piping may not be installed in an exhaust duct over a frying vat or grill.