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2.3 Filter selection
You can identify various filters by the colour
and protection designation of the filter label.
Note. A particle filter provides protection only
against particles. A gas filter provides protec-
tion only against gases/vapours. A combined
filter protects against both gases/vapours
and particles.
2.3.1 Particle filters
All Sundström particulate filters trap and hold
particles in the filtering media. As the amount
of the captured contaminant in the media in-
creases, breathing resistance also increases.
Replace the filter after 2 – 4 weeks or earlier if
the change in breathing resistance becomes
noticeable. Filters are consumables with a
limited service life. A filter exposed to strong
press or impact or with visible damage must
immediately be scrapped.
2.3.2 Gas filters
Each gas filter is designed to provide respiratory
protection against specific contaminants. A gas
filter absorbs and/or adsorbs specific vapours
and gases from a contaminated atmosphere.
This process continues until the absorbent
becomes saturated and allows the contaminant
to break through.
2.3.3 Combined filters
In environments in which both gases and
particles occur, such as in spray painting, gas
and particle filters must be combined.
• Place the particle filter on top of the cartridge.
Grasp both protective elements.
• Squeeze hard until you hear the particle filter
snap onto the gas filter. Fig. 1a.
• Place a pre-filter into the pre-filter holder.
• Snap the pre-filter holder on the filter or
cartridge.
Note. The particle filter will always be snapped
on the gas filter, but the gas filter will not snap
onto the particle filter. The gas filter will always
be inserted into the respirator.
To separate the combined gas and par-
ticle filter
• Place a coin it in the space between the
lower lip of the particle filter and the small
tab moulded into the side of the gas filter.
• Push firmly and twist the coin until the filter
pops off. Fig 1b.
2.3.4 Pre-filter SR 221
The Sundström pre-filter SR 221 is not a protec-
tive element and can never be used as primary
protection or as a substitute for a particle filter.
It is designed to prevent nuisance particulates
from reaching the protective elements. This
increases the life span of the primary filter. The
pre-filter holder protects the main filter against
handling damage.
2.3.5 Compressed air attachment
When the half mask is used with compressed
air attachment SR 307 the user instructions
for the relevant equipment must be followed.
3. Donning/Doffing
3.1 To fit the filter in a mask
• Check that you have selected the right
filter and that the use-by date has not
been passed. (Specified on the filter and
is valid provided that the filter packaging is
unopened.)
• Fit the filter/combined filter in the mask so
that the arrows on the filter point towards the
user’s face. Carefully check that the edge of
the filter is in the internal groove of the filter
mounting all around.
• Fit pre-filter SR 221 in the pre-filter holder
and press it into place on the filter.
See also the user instructions for the rel-
evant filter.
3.2 Inspection before use
• Check that the mask is the correct size.
• Check that the mask is complete, correctly
assembled and thoroughly cleaned.
• Check the mask body, membranes, mem
-
brane seats and harness for wear, cuts,
cracks, missing parts, and other defects.
• Check that the appropriate filter is intact and
installed properly.
3.3 Putting the mask on, fig. 2
• Remove any hood, glasses or ear protection
from head.
• Holding the mask in one hand, grab the strap
buckle and pull on the head strap until the
pad is tight against the mask.
• Take out any twists or tangles.
• Holding the strap buckle, pull the strap over
your head and put it around your neck.
