VISION 3
6
4. DON APPARATUS
4.1 ATTACH DEMAND
VALVE
1.
Check that the
VISION 3
head-
harness is fully slackened and that the
DV is connected to the facemask.
2.
Place the neck-strap round the
neck.
3.
Check that the flat on the DV
bypass knob is off (flat on the knob is
towards the facemask).
4.
Press the black reset button.
5.
Follow the appropriate breathing
apparatus’ user instructions to supply air
to the facemask.
4.2 DON FACEMASK
4.2.1
Facemasks with a Web
Harness
1.
Hold the head-harness lower
straps, place chin in chin-cup and pull
straps over back of head, brushing hair
away from faceseal.
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.
4.2.2
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.
