| 摘要 |
Protective breathing apparatus comprises a power-driven air blower which draws contaminated ambient air through selectively appropriate filters and propels the resultant purified air in controlled flow through conduit means into a flexible transparent plastic breathing hood encompassing the wearer's head and releasably secured by a neck ban around the wearer's neck. The purified air introduced into the breathing hood is distributed and circulated through the hood's interior, the current of air holding the hood substantially out of contact with the wearer's head. After the purified air has been breathed and then exhaled, it is expelled through an exhaust port to the atmosphere. Optional provision is made for adjusting the temperature of incoming treated air for maximum user comfort, and for a plurality of breathing hoods to be supplied by a single purified air source.
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