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I would check the condition of all the web straps that they are not worn and that they are secure about the body. Inspect the air content gauge and ensure that the bottle is full. When turning on the air valve I would listen for the ‘whistle’ alarm signal. When placing the mask over the face an even tension must be applied to the mask straps in order to create an airtight/smoke seal. This would be subsequently checked by shutting the air valve so that the wearer would experience the mask ‘crushing’ onto the face, so creating a partial vacuum. This denotes that the wearer is not drawing air from around the sealed mask, and is therefore providing an effective smoke seal. I would
then open up the valve to allow the wearer to breath on demand. Finally, communication with the wearer and the control position would be checked to ensure a safe entry.