- makes use of a hose to deliver clean, safe air from a stationary source of
compressed air
- provides clean air for long periods of time and are light weight for the user
- limits the range of user-mobility and may fail due to hose damage
- also called airline respirators
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- have an auxiliary self-contained air supply that can be used if the primary supply fails
- the self-contained portion can be small since it only needs to supply enough air for
escape
- can be used for entry into confined spaces
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- consists of a wearable, clean-air supply pack
- do not restrict movement with a hose connection
- the closed-circuit type can provide air up to 4 hours
- the open-circuit type only provide air for 30 - 60 minutes
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