But Do They Really Make You Feel Better?

Air filters in general do a good job of clearing the air. But do they actually make you feel better? The medical verdict is still out. According to Andrew Filderman, M.D., a pulmonary specialist in Rockport, Maine, no controlled studies have been done on the subject. "We know these things filter the stuff, but we don't know if it helps," he says. "It's difficult to prove because there are so many provocative things in the air, and you don't always know what's causing the problem." Dr. Filderman adds that while some allergic or asthmatic patients report benefits from air filters, the evidence remains anecdotal. "If source control and ventilation don't help," he says, "it's not unreasonable to try a filter."

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