How should excess oxygen be removed after using the PBE?

The appropriate method for removing excess oxygen after using the Portable Breathing Equipment (PBE) is to breathe out sharply. This action helps to expel any remaining oxygen from the helmet, allowing for a more efficient removal of the equipment. Proper technique is crucial as it helps ensure that any residual oxygen is cleared, reducing the risk of fire hazards or other complications that could arise from having excess oxygen trapped in the helmet.

Option to shake the helmet would not effectively remove the excess oxygen as it does not provide a direct method for expelling the gas. Likewise, ventilating the area is a good general safety practice but does not address the immediate need for clearing the helmet itself. Placing the helmet near a fire is extremely dangerous and could lead to combustion or further hazards, as it would be counterproductive to the purpose of using PBE. Thus, breathing out sharply stands out as the most effective and safe method to clear excess oxygen after using the PBE.