the 1-inch and 5-inch pleated media filters reduced I/O
ratio of PM2.5 from 0.40 to 0.27 (a 32.5% decrease, 95% CI:
29-36%) and from 0.40 to 0.08 (an 80% decrease, 95% CI:
79-81%), respectively (7). Practical considerations that may
limit the use of increased filtration include added energy
costs, noise, and wear and tear to the ventilation system.
Macintosh et al. [2010] modeled the health benefits of
using a whole house in-duct air cleaner (14). The indooroutdoor
ratio of PM2.5 will decrease from 0.57 with natural
ventilation (passive air exchange through windows and other
openings), to 0.35 with conventional in-duct filtration, to 0.1
with HEPA (high efficiency particle air) in-duct filtration.
Based on modeling of the metropolitan areas of Cincinnati,
Cleveland, and Columbus, Ohio, reduction in PM2.5 I/O
ratio from 0.57 to 0.1 after adoption of in-duct HEPA
filtration would lead to estimated annual decreases of 700
(0.014%) premature deaths, 940 (0.019%) hospital and ER
visit, and 130,000 (2.6%) asthma attacks
the 1-inch and 5-inch pleated media filters reduced I/Oratio of PM2.5 from 0.40 to 0.27 (a 32.5% decrease, 95% CI:29-36%) and from 0.40 to 0.08 (an 80% decrease, 95% CI:79-81%), respectively (7). Practical considerations that maylimit the use of increased filtration include added energycosts, noise, and wear and tear to the ventilation system.Macintosh et al. [2010] modeled the health benefits ofusing a whole house in-duct air cleaner (14). The indooroutdoorratio of PM2.5 will decrease from 0.57 with naturalventilation (passive air exchange through windows and otheropenings), to 0.35 with conventional in-duct filtration, to 0.1with HEPA (high efficiency particle air) in-duct filtration.Based on modeling of the metropolitan areas of Cincinnati,Cleveland, and Columbus, Ohio, reduction in PM2.5 I/Oratio from 0.57 to 0.1 after adoption of in-duct HEPAfiltration would lead to estimated annual decreases of 700(0.014%) premature deaths, 940 (0.019%) hospital and ERvisit, and 130,000 (2.6%) asthma attacks
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