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user must switch the D/PD exhalation valve to the AIR-LINE position to use the res-
pirator in the air supplied mode of operation. When the air-line is disconnected or if
the air source is lost for any reason, the user must switch the D/PD exhalation valve
back to the FILTER/CANISTER position to again use the respirator in the air purify-
ing mode of operation.
Inhaled air enters the respirator either through the filter or canister or from the air-
line. The inhaled air passes over the facepiece lens, keeping it free from fog, before
it is taken into the lungs. Exhaled air leaves the facepiece through the exhalation
valve and consequently is not rebreathed. A check valve prevents the exhaled air
from passing out through the filter or canister.
Note: Training on the Pressure Demand Duo-Flo Respirator should include a brief
familiarization period where the employee is allowed to use the device in both
modes. This will allow the employee to recognize the higher breathing resistance
associated with the air-line position of the D/PD exhalation valve and allow him/her
to practice switching the valve from one position to the other.
Respirator Use Limitations
The wearer must comply with the following MSA respirator use limitations:
1. Maximum Use Concentration
Do not exceed ANY of the applicable maximum use concentrations listed
below:
RESPIRATOR
RESPIRATOR
USE
Routine Use in Air-Supplied
Mode Only - including entry,
continuous use and non-
emergency egress
Routine use in air-purifying
mode - including entry,
continuous use, non-
emergency egress and/or
moving from station-to-station
Emergency Escape in Air-
Purifying Mode
4
RESPIRATORS WITH
TYPE
ULTRA FILTER
OPTIFILTER
FULL FACEPIECE
• 1,000 times
Exposure Limit
• IDLH
• 100 times
Exposure Limit
• IDLH
• Unlimited
®
OR
®
XL FILTER CARTRIDGES
HALF MASK
• 10 times
Exposure Limit
• IDLH
• 10 times
Exposure Limit
• IDLH
• Unlimited
RESPIRATORS WITH
CANISTERS
FULL FACEPIECE ONLY
• 1,000 times Exposure
Limit (combined for all
contaminants present)
• IDLH (for any
contaminant present)
Gas/Vapor Contaminants
• Canister Escape Limit
Particulate Contaminants
• High Efficiency Filter:
1000 times Exposure
Limit
• Non-High Efficiency
Filter:
100 times Exposure Limit
• 100 times Exposure Limit
• IDLH
• Canister Escape Limit
Gas/Vapor Contaminants
• Canister Escape Limit
Particulate Contaminants
• Unlimited
TAL 7012 (L) Rev. 2 - 818369
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