1. Hold the end of the strap with both hands and pull the strap out so that the mask completely covers the mouth and nose area. Install the fastener behind the neck to seal the mask to the face.
2. Pull the tape end again and tighten further.
3. Check whether the mask is well sealed before use.
4. During use, when the user smells a peculiar smell or the inhalation resistance increases, it means that the filter box has reached the end of its service life. Please replace the filter box or absorbent cotton immediately.