🔍 Key Concepts

• Fixed CO₂ systems and why the cylinder room is a high‑hazard, high‑pressure space • Differences between safety requirements (access/marking) and system-performance requirements (temperature, ventilation) • When doors on safety-critical spaces must be locked, unlocked, or have controlled access under USCG/IMO rules

💭 Think About

• For each option, ask: Is this requirement about keeping people safe when entering the CO₂ room, or about keeping the system itself reliable? • Think about what could go wrong if the CO₂ bottles or piping were exposed to excessive heat, poor ventilation, or restricted access. • Consider which of these four items is MOST likely to be handled by company policy or signage, rather than a strict, explicit regulatory requirement.

✅ Before You Answer

• Verify which of the four is specifically required by USCG/IMO regulations for fixed CO₂ cylinder rooms, not just "good practice". • Check whether regulations talk about access control and locking of the CO₂ room door or mainly about keeping it readily accessible and protected from unauthorized use. • Confirm if there is an explicit numerical temperature limit or a detailed ventilation requirement in the rules for cylinder rooms.