8. Adjust the mask until it fits comfort-
ably on your face. Adjust headband
straps on both sides to produce a
comfortable fit and tight seal by
pulling on the four headband straps
(Figure 14).
9. PERFORM A NEGATIVE PRES-
SURE FIT CHECK
a. With facepiece on and secured,
close off the opening to the
mask's connector with a finger.
b. Inhale until the mask collapses
inward slightly (indicating there
is negative pressure). Hold your
breath for five seconds.
c. The mask is deemed to be in
proper position if it remained
collapsed while the breath was
being held and no inward leak-
age of outside air was detected.
d. If mask doesn't collapse or inward
leak is detected, readjust mask
on face and repeat above steps
until this test is passed.
10. To connect the mask to the air
delivery system, screw the mask’s
hose connector onto the male fit-
ting that is sewn in the front cen-
ter of the air delivery system (see
Figure 15). DO NOT OVER
TIGHTEN.
11. With the air flowing into the mask,
perform the following fit test:
a. Move your head from side to
side.
b. Look down and then up.
Repeat this several times.
If ANY leakage of air is detected
around the perimeter of the mask
or you feel the seal break, the
mask is not properly fitted. Take
the mask off and re-don the mask
starting with “Donning the Half
Mask” on page 13 of this manual.
Repeat these tasks until the mask
fits correctly and no outward leak-
age is detected.
WARNING
:
IF YOU CANNOT
AT TAIN A PROPER FIT, TRY ANOTH-
E R MASK SIZE AND GO THROUGH
THE SAME STEPS OUTLINED
ABOVE. IF A PROPER FIT IS S T I L L
NOT ACHIEVED, DO NOT USE THE
RESPIRATOR.
DONNING THE HELMET
12. Flip the back of the outer cape
over the LANCER
™
helmet (Figure
16). If using the parka, unzip and
flip the back of the parka over the
helmet.
13. Don the helmet.
14. Use the retaining hoop to secure
the air delivery system inside the
helmet. Insert the back of the hoop
at the center back of the helmet,
underneath the retainer clip. Then
slip the hoop up into the two side
retainer clips. Push the hoop up
into the helmet’s inner groove,
starting at the back and working
forward. The hoop will snap into
place (Figure 17).
15. Make sure the air delivery system
is securely in place.
16. Pull down the back panel of the
protective outer cape.
14
Figure 15
Figure 16
Figure 17
Figure 14
