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  2. HEPA - Wikipedia

    en.wikipedia.org/wiki/HEPA

    HEPA ( / ˈhɛpə /, high-efficiency particulate air) filter, [1] also known as high-efficiency particulate absorbing filter [citation needed] and high-efficiency particulate arrestance filter, [2] is an efficiency standard of air filters. [3] Filters meeting the HEPA standard must satisfy certain levels of efficiency.

  3. The best air purifier for 2024 - Engadget

    www.engadget.com/best-air-purifier-120040002.html

    The Core 400S claims a half-hour air exchange rate for a 1,000-square-foot room and combines the three main filter types — pre-filter, activated carbon and particle — into a single ring ...

  4. Air filter - Wikipedia

    en.wikipedia.org/wiki/Air_filter

    A particulate air filter is a device composed of fibrous, or porous materials which removes particulates such as smoke, dust, pollen, mold, viruses and bacteria from the air. Filters containing an adsorbent or catalyst such as charcoal (carbon) may also remove odors and gaseous pollutants such as volatile organic compounds or ozone. [1]

  5. AlliedSignal - Wikipedia

    en.wikipedia.org/wiki/AlliedSignal

    AlliedSignal, Inc. was an American aerospace, automotive and engineering company, created through the 1985 merger of Allied Corp. and The Signal Companies. It purchased Honeywell for $14.8 billion in 1999, and adopted the Honeywell name and identity. AlliedSignal was a member of the Dow Jones Industrial Average from 1985 until February 19, 2008.

  6. High-pass filter - Wikipedia

    en.wikipedia.org/wiki/High-pass_filter

    A high-pass filter ( HPF) is an electronic filter that passes signals with a frequency higher than a certain cutoff frequency and attenuates signals with frequencies lower than the cutoff frequency. The amount of attenuation for each frequency depends on the filter design. A high-pass filter is usually modeled as a linear time-invariant system.

  7. Here's the Average Social Security Benefit at Age 62 -- and ...

    www.aol.com/heres-average-social-security...

    According to the latest data from the Social Security Administration, the average monthly benefit for someone claiming at age 62 is $1,275. If you look at averages by gender, there's a disparity ...

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