Respironics BiPAP - Pneumatic System; Air Inlet Filters; Muffler

Chapter 3
3-2 BiPAP Focus Ventilator Service Manual © Respironics, Inc. REF 1029568 Rev B
Theory of Operation
3.1 Pneumatic
System
Figure 3-1 shows a pneumatic diagram of the BiPAP Focus ventilator.
Figure 3-1: BiPAP Focus Pneumatic Diagram
3.1.1 Air Inlet Filters
Air inlet filters:
• The gray reusable filter removes coarse particulate from ambient air
entrained by the blower.
• The white disposable filter is optional, and is recommended for
enhanced particulate filtration.
3.1.2 Muffler
The muffler reduces the noise of air flow into the blower. This is done by
channeling the air through a baffled system lined with sound absorbing
material. The channel also provides a path for air recirculation.
BiPAP Focus ventilator
Air inlet
filter(s)
Muffler
Air inlet
port
Blower
(motor)
Flow
valve
Diffuser
Bacteria filter
(mandatory)
Oxygen enrichment
adapter (if using oxygen)
Tubing (elbow)
Pressure sensor
Patient circuit (to
mask outlet)
Oxygen safety valve
(if using oxygen)
Outlet port and
pressure sensor
Flow sensor
Reusable
particulate filter
(gray)
Disposable particulate
filter (white)
Muffler