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  2. Absorption refrigerator - Wikipedia

    en.wikipedia.org/wiki/Absorption_refrigerator

    An absorption refrigerator is a refrigerator that uses a heat source to provide the energy needed to drive the cooling process. Solar energy, burning a fossil fuel, waste heat from factories, and district heating systems are examples of convenient heat sources that can be used. An absorption refrigerator uses two coolants: the first coolant ...

  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. The best power banks and portable chargers for 2024 - Engadget

    www.engadget.com/best-power-bank-143048526.html

    Quick Overview. Anker MagGo Power Bank (10K) Best MagSafe-compatible power bank. $90 at Amazon. Anker Nano Battery (Foldable USB-C) Best battery for a partial charge on an Android. $26 at Amazon ...

  5. Solar-powered GENNY pulls clean water from the air - Engadget

    www.engadget.com/2020-01-08-solar-genny-watergen...

    It essentially turns air and sun into clean water. Watergen's GENNY runs on a simple mechanism. It draws moist air in through a filter at the back of the device like a dehumidifier then cleans and ...

  6. NIOSH air filtration rating - Wikipedia

    en.wikipedia.org/wiki/NIOSH_air_filtration_rating

    The NIOSH air filtration rating is the U.S. National Institute for Occupational Safety and Health (NIOSH)'s classification of filtering respirators. The ratings describe the ability of the device to protect the wearer from solid and liquid particulates in the air. The certification and approval process for respiratory protective devices is ...

  7. Water filter - Wikipedia

    en.wikipedia.org/wiki/Water_filter

    A water filter removes impurities by lowering contamination of water using a fine physical barrier, a chemical process, or a biological process. Filters cleanse water to different extents, for purposes such as: providing agricultural irrigation, accessible drinking water, public and private aquariums, and the safe use of ponds and swimming pools .

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