17
1
2
а
b
c
1 – the tongue on the bearing flange of the seat; 2 – the tongue on the filter base
Figure 2 – Coupling the filter to the Mask
6.1.3 In case of defects found the Mask must be replaced by a new one, and the
new Mask shall be checked as stated in clause 6.1.2.
6.2 Putting On the Mask
6.2.1 The Mask shall be put on as follows:
– couple the filters to the Mask; to do that, align three grooves on the filter base
respectively with three tongues in the seat of the inhalation valve with the bayonet
on the lateral surfaces of the Mask visor (it is necessary to align the tongues on
the bearing flange of the seat and the respective elements of filter base) and turn
clockwise until tight (Figure 2, а, b, c);
– slack the head harness straps up to restraints;
– remove the hair from the forehead and temples to prevent from their getting
under the Mask obturator;
– put on the Mask; to do that, take the Mask with two hands by the cheek straps
of the head harness, stretch the straps sideways, fix the chin in the lower pocket of
the sealer obturator and put the head harness on the head with a movement of the
hands upwards and backwards;
– holding the Mask with one hand by the valve unit, check for correctness of the
chin location in the deepening;
– pull the temporal, cheek and frontal straps until tight;
– get rid of misfit, twists and turns of the obturator and straps of the head
harness. Make sure that the Mask obturator and undermask fit tightly to the face
without any displacement, at rest, as well as when the head moves sideward,
upwards and downwards.
6.2.2 To verify the correctness of wearing the mask, its assembly with a filter and
in good condition:
– put on the mask (see clause 6.2.1);
– close by hand the hole in the bottom of the filter;
– take 3–4 attempts to taking a deep breath.
