Ozone-removal efficiencies of activated carbon filters after more than three years of continuous service

This paper evaluates the efficiency with which commercial charcoal filters remove ozone. Three different applications have been examined: a test plenum, an air handler providing outside air to a Class 100 clean room, and a plenum downstream of an air handler providing outside air to another Class 10...

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Bibliographic Details
Main Authors: Weschler, Charles J, Shields, Helen C, Naik, Datta V
Format: Conference Proceeding
Language:English
Subjects:
Activated carbon
AIR CLEANING SYSTEMS
AIR FILTERS
AIR POLLUTION CONTROL
Charcoal
ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
INDOOR AIR POLLUTION
OZONE
Q1
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Summary:This paper evaluates the efficiency with which commercial charcoal filters remove ozone. Three different applications have been examined: a test plenum, an air handler providing outside air to a Class 100 clean room, and a plenum downstream of an air handler providing outside air to another Class 100 clean room. After 37 months, the charcoal in the test plenum has decreased in removal efficiency from 95% to 90%. After 37 months, the charcoal servicing the first clean room has decreased in efficiency from 85% to 60%. After 24 months, the charcoal servicing the second clean room is still removing 95% of the ozone in the airstream. The charcoal filters associated with the test plenum and the second clean room are better protected from submicron particles than those associated with the first clean room. The accumulation of fine particles on the charcoal appears to influence service life. This work is an extension of the preliminary results (20 months of service) that were reported for the filters associated with the test plenum and the first clean room (Weschler et al. 1993).
ISSN:0001-2505