If ventilation methods fail, what should be the immediate reaction?

Exiting the confined space is the most appropriate immediate reaction if ventilation methods fail, as it prioritizes the safety of the workers. When ventilation is inadequate, there is an increased risk of hazardous atmospheric conditions, such as the accumulation of toxic gases, insufficient oxygen, or flammable vapors. These hazards can escalate quickly and pose serious health risks to those inside the confined space.

By evacuating the area, workers minimize their exposure to potentially life-threatening conditions. It is essential for personnel to be aware of the signs of ventilation failure, and in such situations, the safest action is to leave the space as quickly as possible to ensure their safety.

Other options may be valid actions under specific circumstances, but they do not provide the same immediate level of safety. For example, using personal protective equipment may not mitigate the risks if the atmosphere is significantly compromised. Contacting emergency services or increasing the number of attendants may also be necessary but should not replace the critical first step of ensuring that everyone is out of the hazardous environment.