PRO-PAK
14
3.7.3 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 and check that the
DV first breath mechanism operates.
3.8 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.
2. Hold breath for ten seconds and
listen for leaks. If there are leaks, loosen
the head-harness and adjust the mask for
a comfortable leak-tight fit and repeat
test. DO NOT over-tighten the head-
harness.
3. DO NOT USE apparatus that leaks.
Attach an explanatory note and return for
service.
4. When satisfied with the apparatus,
press the DV reset knob, remove the
facemask and close the cylinder valve.
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