PRO-PAK
17
1. Hold the head-harness lower
straps, place chin in chin-cup and pull
straps over back of head, brushing hair
away from face-seal.
2. Adjust the facemask top strap so
that the mask is at the correct level with
the face and the head-harness pad is in
the centre of the back of the head, then
tighten harness straps in sequence:
Bottom, Middle, Top. DO NOT over-
tighten.
3. Inhale deeply to activate the DV
then breathe normally.
4.3.2 Facemasks with a Net
Harness
1. Hold the mask by the side of the
net harness, place the chin into the chin-
cup and pull the mask onto the face.
Grasp the pull-strap at the rear of the net
harness and pull the net over the head.
2. Tighten harness side straps. DO
NOT over-tighten.
3. Inhale deeply to activate the DV
then breathe normally.
4.4 POSITIVE PRESSURE
TEST
1. With the cylinder valve open, insert
a finger under face-seal and check for a
steady outward flow of air. Remove finger
and allow mask to re-seal.
4.5 FACEMASK SEAL TEST
1. Close the cylinder valve and keep
hold of the hand-wheel. Hold breath for
10 seconds and listen carefully for leaks.
A leak will cause the pressure gauge
reading to fall.
2. If the facemask fails the leak test:
open the cylinder valve, loosen the head-
harness adjust the facemask and repeat
the test.
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