Question 3714 Deck General

The correct answer is B) 5 minutes. According to the regulations for ventilation systems on mobile offshore drilling units (MODUs), each ventilation system for an enclosed classified location must provide a complete change of air every 5 minutes. This requirement is specified in 46 CFR 111.105-31(c), which states that the ventilation system must "provide a complete change of air in the classified location at least every 5 minutes." The other options are incorrect because they do not match the regulatory requirement of a 5-minute air change. 3 minutes (A) and 7 minutes (C) are not the correct time interval, and 10 minutes (D) is too long for a complete air change in an enclosed classified location on a MODU.