Labconco Protector 3930000 User Manual page 37

Chapter 5: Appropriate Applications for Your Enclosure
Hazardous Misapplications for Carbon
Filters with Volatile Chemicals
There is one scenario where the accessory carbon filter misapplication
would be a part of a hazardous condition. If the user continues to operate
the enclosure with any of the following conditions present a potentially
hazardous condition will exist:
1. The inlet concentration of vapors is greater than the TWA.
2. The carbon filter becomes saturated.
3. The ventilation of the room is insufficient to dilute the exhaust of the
enclosure to below the TWA for the chemical.
When the inlet concentration is greater than the TWA, extra measures
must be taken to monitor the filter and number of room air exchanges.
Chemical Carcinogen Use with Carbon
Filters
Selected carcinogens may be used safely with carbon filters under the
following restrictions.
! The use of a vented fume hood or ventilated enclosure
with ducting to the outside is always the preferred
method when working with carcinogens. The carbon
filters should only be used as a last resort when venting
to the outside is not an option.
The potential carcinogens are listed in the NIOSH Pocket Guide to
Chemical Hazards as "Ca." Each potential carcinogen must have a TWA
of 1 or greater; have minimum respirator recommendation of Escape
GMFOV, and an odor threshold significantly lower than the TWA for the
chemical.
The inlet concentration or the evaporation rate of the chemical must never
exceed the TWA for the chemical.
Consult a Labconco Technical Specialist for estimated saturation life. See
Chapter 6 for an example of estimating saturation life. Another source is
the Labconco chemical guide for carbon filtered enclosures.
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