ZOLL AEV Operator's Manual page 59

CPAP (Continuous Positive Airway Pressure) -- The patient receives constant positive
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airway pressure while breathing spontaneously. Spontaneous breaths are either demand flow
or supported using Pressure Support.
BL (Bi Level) -- the ventilator provides two pressure settings to assist patients breathing
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spontaneously: a higher inhalation pressure (IPAP) and a lower exhalation pressure (EPAP).
Press the Mode parameter button to highlight the current ventilation mode. Press the Mode
parameter button again to select volume or pressure targeting which is shown as either "(V)"
for volume or "(P)" for pressure.
906-0731-01-05 Rev. C ZOLL Ventilator Operator's Guide 4-3