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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 withOdor 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. Another option is the use of the XPert Filtered Balance Station, which uses a remote blower. 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 XPert Filtered Balance System motorized impeller cannot be exposed to acids. Where applications require the use of acids, a 41 Chapter 5: Using Your Filtered Enclosure and Appropriate Application 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. NOTE: Low level acids can be used with the XPert Filtered Balance Station, which uses a remote blower. C CCH HHA AAP PPT TTE EER RR 6 66 M MMA AAI IIN NNT TTA AAI IIN NNI IIN NNG GG Y YYO OOU UUR RR F FFI IIL LLT TTE EER RRE EED DD E EEN NNC CCL LLO OOS SSU UUR RRE EE Monitoring airflow and changing the filters is the primary maintenance required. Decontamination may be required and is reviewed in Chapter 6. Certification and recertification is reviewed in Chapter 6. Review this chapter on maintenance for the following: 1. Routine Maintenance. 2. Decontamination. 3. Determination of when to replace the HEPA filters. 4. How to install a new HEPA filter with the bag-in/bag-out procedure on XPert Filtered Balance Systems & Stations. 5. HEPA filter leak test. 6. Speed control adjustment and setting the inflow face velocity. 7. Operating and calibrating the airflow monitors. 8. Determination of when to replace Odor Control carbon filters and how to replace. 9. Calculating Odor Control carbon filter life. 10. Initial certification. 11. Re-certification. 12. Fluorescent light replacement. 13. Motorized impeller replacement. 14. Speed...

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