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This study assessed six commercially available in-duct air cleaning devices which are designed to be mounted in the central ventilation system of offices or commercial buildings. The selected devices use different air cleaning technologies: mechanical filtration, electrostatic precipitation, gas filtration, ionization / cold plasma, photocatalytic oxidation (PCO) and catalysis under UV light. They were tested against particles, a mixture of volatile organic compounds containing acetone, acetaldehyde, toluene, heptane and formaldehyde, and two bio-contaminants: Aspergillus brasiliensis (fungus) and Staphylococcus epidermidis (bacteria).

Two different test rigs were used. The single pass efficiency of each device was determined for three airflow rates, corresponding to face velocities ranging from 0.9 to 2.7 m/s, and two sets of temperature and humidity that are representative of indoor air conditions in wintertime and …