18
Size Selection
GB
G1 Integrated SCBA System
2.9
G1 Voice Projection Speaker (Optional for Version with Integrated Electronics)
The voice projection speaker amplifies and clarifies the speech from the full face mask during use.
When inhaling, the breathing sound will not be amplified. The voice projection speaker is turned
OFF when the complete SCBA is turned OFF and can also be activated/deactivated with its
button. Pressing of the button is acknowledged by a beep.
3
Size Selection
Regardless of facial dimensions and respirator sizing charts, an actual respirator fit test, either
qualitative or quantitative, is recommended according to EN 529:2005 to ensure the correct respi-
rator size selection.
(1) Fit test the respirator size relative to your facial features and dimensions. The safety admin-
istrator or program manager might assist in selecting the initial size to try.
(2) Carefully don the mask and conduct a negative pressure seal check. See donning instruc-
tions for procedure.
(3) If the full face mask does not pass the negative pressure seal check or feels uncomfortable,
try the next nearest size relative to your face.
Once the proper size is selected, the respirator must pass a negative pressure seal check every
time the full face mask is donned to ensure proper fit before using the respirator.
If other than facial seal leakage is detected, the condition must be investigated and corrected
before another check is carried out.
The full face mask must also pass the negative pressure seal check before the user attempts to
enter a toxic atmosphere.
The full face mask will not furnish protection unless all inhaled air is drawn from the SCBA only.
