After flooding a compartment with CO2, how long should you wait before opening it?

When flooding a compartment with carbon dioxide (CO2), it is essential to allow sufficient time for the gas to effectively displace oxygen and reduce the overall oxygen levels in the compartment. Waiting 15 minutes is generally recommended because this duration allows for adequate time for CO2 to completely fill the area, ensuring that the environment inside the compartment is safe before any personnel re-enter.

CO2 is heavier than air and takes a little time to thoroughly mix and ensure that the oxygen levels have dropped to a point where it is no longer breathable. Entering too soon could expose individuals to the risk of hypoxia or other complications related to low oxygen levels. Thus, a waiting period of 15 minutes strikes a balance between safety and efficiency, allowing enough time for the CO2 to do its job effectively.

Other options may not provide enough time for the CO2 to fully take effect, which could pose safety risks if personnel were to enter too quickly.