Therapy pressure
Dead space
information
Resistance with
Anti Asphyxia Valve
(AAV) closed to
atmosphere
Inspiratory and
expiratory
resistance with Anti
Asphyxia Valve
(AAV) open to
atmosphere
Anti Asphyxia Valve
(AAV) open-to-
atmosphere
pressure
Anti Asphyxia Valve
(AAV) closed-to-
atmosphere
pressure
8
3 to 40 cm H
0
2
Physical dead space (mask and elbow) using the large cushion is
366 mL.
Drop in pressure measured
(nominal)
Inspiration at 50 L/min
Expiration at 50 L/min
≤2 cm H
O
2
≤2 cm H
O
2
at 50 L/min: 0.5 cm H
at 100 L/min: 1.1 cm H
1.0 cm H
O
2
1.5 cm H
O
2
O
2
O
2