title: Whole house particle removal and clean air delivery rates for in-duct and portable ventilation systems.
abstract: A novel method for determining whole house particle removal and clean air delivery rates attributable to central and portable ventilation/air cleaning systems is described. The method is used to characterize total and air-cleaner-specific particle removal rates during operation of four in-duct air cleaners and two portable air-cleaning devices in a fully instrumented test home. Operation of in-duct and portable air cleaners typically increased particle removal rates over the baseline rates determined in the absence of operating a central fan or an indoor air cleaner. Removal rates of 0.3- to 0.5-microm particles ranged from 1.5 hr(-1) during operation of an in-duct, 5-in. pleated media filter to 7.2 hr(-1) for an in-duct electrostatic air cleaner in comparison to a baseline rate of 0 hr(-1) when the air handler was operating without a filter. Removal rates for total particulate matter less than 2.5 microm in aerodynamic diameter (PM2.5) mass concentrations were 0.5 hr(-1) under baseline conditions, 0.5 hr(-1) during operation of three portable ionic air cleaners, 1 hr(-1) for an in-duct 1-in. media filter, 2.4 hr(-1) for a single high-efficiency particle arrestance (HEPA) portable air cleaner, 4.6 hr(-1) for an in-duct 5-in. media filter, 4.7 hr(-1) during operation of five portable HEPA filters, 6.1 hr(-1) for a conventional in-duct electronic air cleaner, and 7.5 hr(-1) for a high efficiency in-duct electrostatic air cleaner. Corresponding whole house clean air delivery rates for PM2.5 attributable to the air cleaner independent of losses within the central ventilation system ranged from 2 m3/min for the conventional media filter to 32 m3/min for the high efficiency in-duct electrostatic device. Except for the portable ionic air cleaner, the devices considered here increased particle removal indoors over baseline deposition rates.
authors.affiliation: Environmental Health & Engineering, Inc., Needham, MA 02494, USA. dmacintosh@eheinc.com
authors.forename: David L
authors.initials: DL
authors.lastname: Macintosh
authors.forename: Theodore A
authors.initials: TA
authors.lastname: Myatt
authors.forename: Jerry F
authors.initials: JF
authors.lastname: Ludwig
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Baker
authors.forename: Helen H
authors.initials: HH
authors.lastname: Suh
authors.forename: John D
authors.initials: JD
authors.lastname: Spengler
mesh_terms: D000395:Air Pollutants, Occupational / Q000032:analysis*; D000397:Air Pollution / Q000032:analysis*; D004784:Environmental Monitoring / Q000706:statistics & numerical data*; D055904:Meteorology / Q000706:statistics & numerical data*; D015233:Models, Statistical; D010083:Oxidants, Photochemical / Q000032:analysis*; D010126:Ozone / Q000032:analysis*; D013785:Thailand; D014744:Vietnam; D014887:Weather
chemical_list: D000395:Air Pollutants, Occupational; D010083:Oxidants, Photochemical; D010126:Ozone