Section 181.420 - Pre-engineered fixed gas fire extinguishing systems(a) A pre-engineered fixed gas fire extinguishing system must: (1) Be approved by the Commandant;(2) Be capable of manual actuation from outside the space in addition to automatic actuation by a heat detector;(3) Automatically shut down all power ventilation systems and all engines that draw intake air from within the protected space; and(4) Be installed in accordance with the manufacturer's instructions.(b) A vessel on which a pre-engineered fixed gas fire extinguishing system is installed must have the following equipment at the operating station: (1) A light to indicate discharge;(2) An audible alarm that sounds upon discharge; and(3) A means to reset devices used to automatically shut down ventilation systems and engines as required by paragraph (a)(3) of this section.(c) Only one pre-engineered fixed gas fire extinguishing system is allowed to be installed in each space protected by such a system.