VISION 3
5
3.2.2 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.
3.2.3 All Facemasks
Inhale deeply and check that the DV first
breath mechanism operates.
3.3 POSITIVE PRESSURE
TEST
1. With the cylinder valve open, insert
a finger under faceseal 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
servicing.
3.4 BREATHING
APPARATUS TESTS
Perform any tests detailed in the
appropriate breathing apparatus user
instructions.
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