INTERSPIRO Respire N Manuel De L'utilisateur page 10

7. Hold the breathing valve so that the guiding bracket on the breathing valve
goes into the support on the face mask (pointed out by an arrow in the
image).
Turn the locking ring clockwise until the breathing valve is locked in place.
8. Hold your breath and listen for leakage. Adjust the face mask if necessary.
NOTICE
Local regulations may require additional tests to be performed
before use of the face mask.
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Respire N