III. SPECIFICATIONS, CONNECTIONS AND USER INTERFACE- CONT.
15
MAXIMUM PRESSURE RELIEF VALVE
A preset, relief valve exits the rear of the unit. This valve establishes the maximum safety pressure deliverable. It is set at
80 cmH
2
O.
WARNING: IT SHOULD NEVER BE OBSTRUCTED.
NEGATIVE PRESSURE RELIEF VALVE
A preset, negative pressure valve also exits the rear of the unit. It allows the patient to breathe ambient air if the entire
system should become inoperative. It opens at approximately -4 cmH
2
O.
WARNING: IT SHOULD NEVER BE OBSTRUCTED.
WARNING: Should the use of the negative pressure relief valve become necessary,
the operation of the Crossvent in a contaminated environment can be hazardous.
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