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Positive pressure, filtered air inflow maintains isolation just as in a conventional, tight fit PAPR

Plastic bag hood protects entire head

Comfortable, yet effective seal around neck with personal utility strap.

Expiration is via one way valved ports. System is kept under positive pressure. In actual usage, the valves rarely actually need to close.

Warning: Do not seal bag until fresh gas inflow and expiratory ports are present.

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