3M SCOTT AIR-PAK X3 PRO Operating & Maintenance Instructions page 36

OPERATING THE RESPIRATOR
1 Adjust the head straps to the full outward position. See
2 Hold the facepiece in one hand. Fold the head harness over the lens
(see Figure 3-4), or hold the head harness up and out of the way
with the other hand.
3 Place the facepiece centered on the face with the chin properly
positioned in the chin cup. See
4 Using the hand hold at the bottom of the netting, pull the head
harness over the crown of the head and 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.
See Figure 3-6.
5 Verify that no hair or clothing interferes with the face-to-facepiece seal. Verify that the head harness forms a
close fit to your head.
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Figure 3-5.
Figure 3-3.
Figure 3-3 Adjusting the head straps to the fill
outward position
Figure 3-4 Folding the head harness over the lens
Figure 3-5 Positioning the chin
Figure 3-6 Placing the facepiece on the face
P/N 595373-01 Rev C 202004