HVAC filters can have a significant influence on indoor air. In addition to removing particulate contaminants in HVAC air, filters accumulate a particle layer that can react with ozone. Ozone-particle cake reactions serve as a sink for ozone and a source of secondary carbonyls. The location of filters in air distribution systems can lead to these by-products being distributed throughout a building. Two experiments were performed to determine the ozone removal efficiency, η, on filters that were loaded with particles for one month (#1) and three months (#2). On both filters, η dropped rapidly during the first 30 minutes and then stayed approximately constant at 0.1 for Filter #1 and 0.14 for Filter #2 for 4 hours at an airflow of 20 L/min. In this paper, we describe a model that predicts ozone reactions on particle-laden commercial and residential HVAC filters.
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