Chapter 3
3-2 BiPAP® Focus™ Ventilator Service Manual © Respironics, Inc. REF 1029568 Rev A
Theory of Operation
Air Delivery System Components
Air Inlet Filter(s) The air inlet filter removes coarse particulate from
ambient air as it is entrained into the blower assembly.
See Section 4 for periodic maintenance information.
The BiPAP Focus has a reusable dust filter that is gray in
color. An optional pollen filter, white in color is also
available.
Blower The blower draws room air though the air inlet filter and
muffler, and outputs air for delivery to the patient. The
DC impeller-type blower recirculates air through the flow
valve when not delivering gas to the patient. Compressor
speed is determined by patient settings. The controller
PCB controls compressor speed.
Table 3-1: Air Delivery System Components
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