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1.3 FACE MASK
The outer and inner masks are made from a specially compounded rubber material to
ensure a high degree of resistance to ozone ageing and acceptability to the wearer.
The mask is equipped with a large, easily replaceable visor which is held in place
by two half frames and two screws. The S9 mask includes a visor meeting the Lens
Radiant Heat Resistance Performance and Elevated Temperature Heat and Flame
Resistance Performance requirements of NFPA 1981-2019. The S9 mask is available
with either a fabric head harness or a rubber head harness. The face piece also has
provisions for tting spectacles.
A speech diaphragm is mounted within the inner mask with a direct outlet to outside
the mask to ensure the best possible communication. In addition, an inner cone over
the speech diaphragm enhances the speech diaphragm performance. As a further
enhancement to speech reproduction an external speech cone is tted which also acts
as a positive security lock for the breathing valve.
The S9 mask is available in four sizes: SMALL, MEDIUM, LARGE, and EXTRA LARGE.
The standard size facemask is the LARGE size.
Size markings:
• The SMALL mask is marked “S” on the outer mask and “M” on the inner mask.
• The MEDIUM mask is marked “M/L” on the outer mask and “M” on the inner mask.
• The LARGE mask is marked “M/L” on the outer mask and “L” on the inner mask.
• The EXTRA LARGE mask is marked “XL” on the outer mask and “L” on the inner
mask.
Size marking on outer mask Size marking on inner mask
AMBIENT AIR HATCH MASK
Positive pressure is activated by closing the ambient air hatch by pushing the
exhalation valve cover against the face mask. To shut off positive pressure and
breathe ambient air, simultaneously press down the indicator arm and push the
exhalation valve cover away from the face mask.
Activated positive pressure Ambient air mode
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