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  2. Corsi–Rosenthal Box - Wikipedia

    en.wikipedia.org/wiki/Corsi–Rosenthal_Box

    Based on the cost of their design, this output amounted to $0.08 per CADR, or roughly ten times cheaper than commercial air purifiers, with quieter operation. [ 3 ] A study of a home-built air purifier to remove wildfire smoke, using a box fan and filter mounted in a window, showed that particulate matter between 1 and 10 μm in size was ...

  3. Air purifier - Wikipedia

    en.wikipedia.org/wiki/Air_purifier

    Active air purifiers release negatively charged ions into the air, causing pollutants to stick to surfaces, while passive air purification units use air filters to remove pollutants. Passive purifiers are more efficient since all the dust and particulate matter is permanently removed from the air and collected in the filters. [ 15 ]

  4. Quart - Wikipedia

    en.wikipedia.org/wiki/Quart

    The quart (symbol: qt) [1] is a unit of volume equal to a quarter of a gallon. Three kinds of quarts are currently used: the liquid quart and dry quart of the US customary system and the imperial quart of the British imperial system. All are roughly equal to one liter. It is divided into two pints or (in the US) four cups. Historically, the ...

  5. Gallon - Wikipedia

    en.wikipedia.org/wiki/Gallon

    A US liquid gallon contains about 3.7854 kilograms (8.3454 lb) of water at 3.98 °C (39.16 °F), and is about five-sixths of an imperial gallon. There are four quarts in a gallon, two pints in a quart and 16 US fluid ounces in a US pint, making the US fluid ounce ⁠ 1 / 128 ⁠ of a US gallon.

  6. United States customary units - Wikipedia

    en.wikipedia.org/wiki/United_States_customary_units

    The common 55-gallon size of drum for storing and transporting various products and wastes is sometimes confused with a barrel, though it is not a standard measure. In the U.S., single servings of beverages are usually measured in fluid ounces. Milk is usually sold in half-pints (8 fluid ounces), pints, quarts, half gallons, and gallons.

  7. Air filter - Wikipedia

    en.wikipedia.org/wiki/Air_filter

    This U-turn takes the air at high velocity across the surface of the oil pool. Larger and heavier dust and dirt particles in the air cannot make the turn due to their inertia, so they fall into the oil and settle to the bottom of the base bowl. Lighter and smaller particles stick to the filtration media in the insert, which is wetted by oil ...

  8. Comparison of the imperial and US customary measurement ...

    en.wikipedia.org/wiki/Comparison_of_the_imperial...

    In 1824, these units were replaced with a single system based on the imperial gallon. [a] Originally defined as the volume of 10 pounds (4.54 kg) of distilled water (under certain conditions), [b] then redefined by the Weights and Measures Act 1985 to be exactly 4.546 09 L (277.4 cu in), the imperial gallon is close in size to the old ale gallon.

  9. Purifier - Wikipedia

    en.wikipedia.org/wiki/Purifier

    Purifier(s) may refer to: Air purifier , a device that filters pollution out of the air Water purification , removing contaminants from water, sometimes using a water purifier

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