Step 1: Fully loosen the head straps and flip all straps over the top of the mask.
Step 2: Use one hand to push the forehead hair back, while the other hand places the mask over the face, ensuring that the internal nose and mouth cover properly enclose the mouth and nose.
Step 3: Hold the mask in place and pull the center of the head strap backward to the upper rear of the head. Position the two side straps above and below the ears, respectively.
Step 4: Sequentially tighten the lower, temple, and top straps to ensure the mask fits snugly against the facial skin.
Step 5: Positive Pressure Airtightness Test
Cover the exhalation valve outlet with your palm and exhale slowly. The mask should slightly inflate, and there should be no air leakage at the contact points between the mask and the face.
Step 6: Negative Pressure Airtightness Test
Cover the filter (cartridge) inlet with your palm and inhale. The mask should slightly collapse, and there should be no air leakage at the contact points between the mask and the face.
Removing the Full-Face Mask:
Push the head strap buckle forward to release the head straps. Lift the mask upward and slowly push it forward to remove it.
