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Troubleshooting
Problem/possible
cause
Solution
Mask is uncomfortable
Cushion incorrectly
inflated
With the air turned off, adjust the straps so that you can
insert two fingers between your cheek and the lower
headgear strap.
Technical specifications
Dead space
information
The dead space of the mask varies according to cushion
size. It is 185 mL for the Medium size.
Resistance
Drop in pressure measured (nominal)
at 50 L/min: 0.1 cm H
2
O
at 100 L/min: 0.7 cm H
2
O
Gross dimensions
S,
M, L, LW:
Mask fully assembled – no headgear.
5.55”/141 mm (H) x 3.58”/91 mm (W) x 4.21”/107 mm (D)
6.06”/154 mm (H) x 3.74”/95 mm (W) x 4.6”/117 mm (D)
Mask setting
options
Select ‘Activa’ (if available) or ‘Standard’ as the mask option
when using the Mirage Activa LT with ResMed devices that
have mask setting options.