Dynamic air supply hood breathing

Easy to use for particulate matter pollution environment.
Appearance compact and light weight, wear comfortable and safe.
Electric supply, no respiratory resistance, how to block air flow control.
Rechargeable lithium-ion batteries, blower to wear on his belt.
Integrating head, breathing, hearing protection, convenient maintenance.
The attachment is suitable for different applications.
A breathing tube may be with body automatically adjust the length.