A2 air-supply mask can be used with any safety helmet on sell to compose air-supply helmet. There is a shawl integrating with the helmet, which can protect the neck and washable. Glass pieces is higher transparency >90% and impact resistant. The face area is airproof，weight：600g. It's suitable for many kinds of dusty and harmful working conditions. It should be used together with respirator type PRF-102R, PRF-103R, or PRF-104H.