3M SCOTT AIR-PAK X3 PRO Operating & Maintenance Instructions page 38

OPERATING THE RESPIRATOR
10 Smooth the head harness down the back of the head and make sure
the net is flat against the head. If necessary, adjust the bottom of
the head harness to sit below the crown of the head. See
Figure 3-10.
11 Verify that the head harness is centered on the crown of the head
and lying flat against the back of the head.
12 Again, use the hand hold at the bottom of the netting to pull the
head harness down the back of the head. Pull forcefully enough that
the facepiece moves up to position your chin snugly within the chin
cup and forms a close fit to your face.
13 Once again, verify the proper location of the face in the facepiece
and the chin in the chin cup.
14 Re-tighten the straps. All straps must be snug and the facepiece
should feel secure. See
15 Perform a personal check of the facepiece and head harness and address any donning problems.
Possible facepiece donning problems include the following (see
•
Head harness strap is twisted.
•
Head harness is off-center or not flat against the head.
•
Head harness is too high on the head.
•
Hair or clothing is in the face seal.
•
Face seal is rolled over inside the facepiece rather than flat against the face.
•
Facepiece sits too low on the face as evidenced by pressure on the forehead or the facepiece contacting
the throat area, permitting a break in the seal.
The photographs in Figure 3-12
facepieces as well. Verify that the facepiece is donned correctly regardless of the head harness style. If any don-
ning problems are found, remove the facepiece and re-don the facepiece correctly.
22
Figure 3-11.
depict the Vision C5 facepiece, but similar conditions can occur with other
Figure 3-10 Adjusting the head harness
Figure 3-11 Verifying facepiece positioning
Figure 3-12):
P/N 595373-01 Rev C 202004