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Details :
Principles of Operation :
Inhaled air is drawn through either
the air-line (when connected and air is flowing) or through the
respirator cartridge (when air is not flowing). The air is then
drawn into the facepiece (where it passes over the facepiece
lens to minimize fogging) before it is taken into the lungs.
Exhaled air then leaves the facepiece through an exhalation
valve.
Approvals & Standards :
MSA Constant Flow Duo-Twin
Respirators are approved by the National Institute for
Occupational Safety and Health (NIOSH) and the Mine Safety and
Health Administration (MSHA) for use in atmospheres not
immediately dangerous to life and health.* These respirators are
approved with an inlet pressure range of 35 to 40 psig and with
8-300 ft. of MSA Air-Supply Hose. The respirator requires a
source of compressed air conforming to at least Grade D
(Compressed Gas Association, Inc., Commodity Specification for
Air, G-7.1, which is now ANSI Z86.1-1973).
Applications :
Asbestos Abatement
Chemical
Construction
Hazardous Materials
Hazards :
Nuisance Odor
Particulate and Dust
Toxic Atmosphere Non-IDLH
Product Information :
MSA offers Duo-Twin Air-Line
respirators in both Constant-Flow and Pressure-Demand versions.
Constant-Flow respirators are normally used where there is an
ample air supply such as provided by an air compressor.
Pressure-Demand respirators are generally used where only
compressed-air cylinders are available. MSA Duo-Twin respirators
feature air-purifying cartridges, which also protect against a
variety of contaminants. If the air supply should ever fail on
the Constant-Flow unit, the user is automatically protected by
the air-purifying cartridge. This product is popular in the
pharmaceutical, chemical, petrochemical and nuclear industries.
The unique Demand/Pressure-Demand (D/PD) switchable exhalation
valve, standard on Pressure-Demand models, also makes these
units especially well-suited for abatement work. This MSA
respirator should not be used in atmospheres containing less
that 19.5% oxygen.
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