1. Different coverage areas: A half face mask can only cover a part of the face, while a full face mask can cover the entire head, including the face, eyes, and respiratory organs.
2. Different breathing methods: Half face masks can only breathe through the mouth and nose, while full face masks can choose to breathe through the mouth and nose or air tanks.
3. Different application scenarios: Half face masks are suitable for some light work and short-term operations, while full face masks are suitable for some places with severe toxic and harmful gases, such as chemical, medical, etc.
