1. Remove the Chemical Oxygen Self Rescuer mask:
1.1 Press the button on the mask.
1.2 Also remove the mask connector from the Chemical Oxygen Self Rescuer.
2, close the oxygen bottle valve
3, take off the cover
4. Take off Chemical Oxygen Self Rescuer
Open the belt: press down on the elastic stop block, remove the buckle, and disengage the ends of the belt; turn the breathing tube over the top of the head so that it falls on the back cover of the respirator. Open the two shoulder straps, use the index finger to tilt the locking clip, let the instrument slowly slide down the back, and place the Chemical Oxygen Self Rescuer upright so that the Chemical Oxygen Self Rescuer cannot fall.
