Labconco Protector Filtered Glove Box - Manual (Page 38)

Chapter 5: Using Your Glove Box
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Appropriate HEPA or ULPA Filter Applications,
Suitability and Guidelines
• Microbiological materials and hazardous solids containment protecting
only the operator and the surrounding environment.
• Weighing of powders.
• Containment of hazardous particulates using a HEPA or ULPA filter.
• Powder or particulate procedures traditionally performed on an open
bench.
• The filtered glove box provides personal and environmental protection from
particulate matter, hazardous powders and microbiological materials.
• This glove box can be used for sample protection by reversing the
blower airflow direction, causing the main chamber to be under positive
pressure. Positive Pressure Conversion Kit is required (see Chapter 7).
• Manipulations that generate gases or vapors, i.e., toxic chemicals or
radionuclides, require the use of a HEPA or ULPA and carbon filter in
combination. Otherwise the glove box should be ducted to the outside.
• Each filtered glove box is provided with two HEPA or ULPA filters.
Follow the Filter change procedure in Chapter 6 for disposal instructions.
For microbiological materials, follow the Decontamination Procedure in
Chapter 6 for disposal instructions.
Definition of Terms
NIOSH – National Institute for Occupational Safety and Health/Mine Safety
and Health Administration. (U.S.A.)
TWA – Recommended Exposure Limits expressed as a Time Weighted
Average. The exposure limit for that chemical for up to a 10-hour workday,
40 hours a week. Expressed in units of parts per million or milligrams per
cubic meter.
Odor Threshold – The value in parts per million or milligrams per cubic
meter for which one might expect to smell a chemical’s presence in the air.
This value is very subjective and detection will vary with the sensitivity of
one’s nose. The period of time until the odor threshold is reached in the
exhaust stream can be estimated from Labconco exclusive computerized filter
modeling program. Contact Labconco on carbon filter life for specific
applications. See Chapter 6.
Saturation Level or Time – There is a limit to the amount of chemical that
can be adsorbed by activated carbon, or neutralized by chemically-treated
carbon. Once the capacity of the carbon is reached, it is considered to be
saturated and will adsorb (or neutralize) no further material; the outlet
concentration of the chemical will equal the inlet concentration from that