Prohibited acid use – Labconco Class I Enclosure Models 3980423 User Manual
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Chapter 5: Appropriate Applications for Your Filtered Enclosure
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Hazardous Misapplications for Odor
Control 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 Odor
Control Carbon Filters
Selected carcinogens may be used safely with Odor Control 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 Odor Control 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.
Prohibited Acid Use
The Purifier HEPA and Purifier Class I filtered enclosures motorized impeller
cannot be exposed to acids. Where applications require the use of acids, a separate
ventilated enclosure or vented fume hood should be used with a remote blower
ducted to the outside. No exceptions are permitted, as the impeller life span will
be limited with acid use.
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