User manual

Provider Manual
11
The circuit, shown in Figure 3–2, consists of:
•Circuit tubing to deliver air from the Harmony to your interface
(e.g., mask)
•A mask or other interface to deliver the prescribed pressure to
your nose or nose and mouth, depending on which interface has
been prescribed for you
• An exhalation port to vent exhaled air from the circuit
Circuit
Tubing
Exhalation Device
(Typical)
Exhalation Ports
(one port on each
side of elbow)
Patient Interface
(Typical)
Circuit with Separate
Exhalation Device
Circuit with Mask with
Integrated Exhalation Ports
Figure 3–2 Typical Breathing Circuits
NOTE: The exhalation port may be part of the mask or may be part of
a separate exhalation device.
The system senses your breathing effort and changes pressure levels
when you inhale and exhale depending on the mode of operation.
The Harmony can operate on AC or DC power. The DC power option is
not intended as a battery backup. When DC power is obtained from a
vehicle battery, the Harmony should not be used while the vehicle’s
engine is running.