1. Positive Pressure Seal:
Place the palm of your hand over the exhale valve and exhale gently. You should feel the facepiece buldge.
Cartridges:
Place the palms of your hands over the cartridges and inhale gently. You should feel the facepiece collapse.
Particulate Filters:
Place your thumbs over the center of the filters and inhale gently. You should feel the facepiece collapse.
Remember: if you don’t have a good seal, entering contaminated areas is dangerous!