III.
S P E C I F I C A T I O N S , C O N N E C T I O N S A N D U S E R I N T E R F A C E - C O N T .
15
M A X I M U M P R E S S U R E R E L I E F V A L V E
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.
N E G A T I V E P R E S S U R E R E L I E F V A L V E
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.