Question 3741 Deck General

The correct answer is B) secure all mechanical ventilation in the protected space. When the valve control release on a fixed CO2 system is operated, it immediately secures all mechanical ventilation in the protected space. This is to prevent the CO2 from being drawn out of the protected space before it can effectively extinguish the fire. The other options are incorrect because: A) the CO2 is not released until the system is activated, C) sounding an alarm in the ballast control room is not an immediate requirement, and D) sounding the general alarm is a separate step, not a direct result of operating the valve control release.