2. Pull the straps over your head and then start tightening them with both of your heads. Make sure you are pulling equally on both sides. Ensure that the face cup fits securely all around your nose, mouth, and chin. For the best seal, you will have to have a freshly shaved face.
3. Block the filter valves with your palms and try to suck in.
4. Let out a long exhale while simultaneously pushing the filter valves in against your face sharply multiple times. Be sure to take your palms off the filter valves between each pump.