MSA offers Duo-Twin Respirators in both

 Constant-Flow and Pressure-Demand versions.

Constant-Flow respirators are normally used where an ample air supply is available, such as that 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 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

NIOSH approved.

MSA offers Duo-Flo

Respirators in both

Constant-Flow and

Pressure-Demand

versions. Constant-Flow

Respirators are normally

used where an ample air

supply is available, such as that

provided by an air compressor.

Pressure-Demand respirators

are generally used where only

compressed-air cylinders are    available. Duo-Flo Respirators use                                 Constant-                                                                         Flow Duo-Flo Respirator

the MSA Ultra Filter, a compact

round filter cartridge that has a

large effective filter area to provide

low-breathing resisting. This

cartridge has a P100 classification.

Duo-Flo Respirators are popular in the

pharmaceutical, chemical, petrochemical,

and nuclear industries. The                       Ultra Filter P100 cartridge

unique D/PD switchable exhalation

valve, standard on Pressure-Demand

respirators, also makes these units

especially well-suited for abatement work. This MSA respirator

oxygen. NIOSH approved

Duo-TwinRespirators

Complete with facepiece, breathing tube, adapter assembly/regulator, web belt and Foster

steel plug and socket assembly

Allows the Pressure Demand Duo-Flo and Duo-Twin Respirators to be approved for

continuous use while in either the air-line or air-purifying mode of operation.

Allows conversion of a Duo-Twin facepiece to a Twin-Cartridge Respirator.

* Cartridges must be ordered separately. See page 13 for ordering information.

Duo-Flo Respirators

Ass

Pressure-Demand Regulator Assemblies (Belt-Mounted)
for Duo-Twin and Duo-Flo Units

The Pressure-Demand Regulator maintains air flow at a minimum of 1.0 inches of water positive

pressure to the facepiece. Flow stops during exhalation when the Pressure-Demand valve opens

at approximately 1.5 inches of water positive pressure. The regulator has an integral belt clip,

which can be easily adjusted along the support belt for comfortable positioning.

Note: For Duo-Flo units, the tee P/N 481931 and check valve P/N 81229 are sold separately.

Constant-Flow Air-Line Adapter Assemblies

Constant-Flow Air-Line Adapter Assemblies

Designed to deliver the required air flow to the facepiece at an inlet pressure range of 35-40

psig for hose lengths of 8 to 300 feet. The adapters include an integral belt clip and male and

female quick-disconnect assemblies.