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In air-filter-speak, there are large particles (hair, pollen, mold) and small particles (bacteria, smoke, viruses). Oreck’s XL is the first home unit to excel at eliminating both, zapping 98 percent of allergens with technology usually reserved for hospitals and nuclear subs. A mesh filter catches large particles so they don’t block the way for smaller ones, which are charged in an electromagnetic field and yanked onto oppositely charged plates coursing with 8,000 volts of electricity, leaving only clean air to pass through. $700; oreck.com
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