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  2. The best air purifiers of 2025 - AOL

    www.aol.com/lifestyle/best-air-purifiers...

    One of tallest (nearly 24 inches) and heaviest (17.5 pounds) air purifiers tested, the Winix 5500-2 Air Purifier is ideal for small-to-medium rooms (up to 360 square feet), with a True HEPA filter ...

  3. Doctors Say This Is How You Can Loosen and Clear Mucus From ...

    www.aol.com/doctors-loosen-clear-mucus-chest...

    Use a humidifier and/or air purifier Environmental adjustments can make a significant difference too, says Dr. Mercola. Try using a humidifier to “maintain humidity levels between 35-45% in your ...

  4. Air purifier - Wikipedia

    en.wikipedia.org/wiki/Air_purifier

    An air purifier or air cleaner is a device which removes contaminants from the air in a room to improve indoor air quality. These devices are commonly marketed as being beneficial to allergy sufferers and asthmatics , and at reducing or eliminating second-hand tobacco smoke .

  5. Thermal expansion valve - Wikipedia

    en.wikipedia.org/wiki/Thermal_expansion_valve

    A thermal expansion valve is a key element to a heat pump; this is the cycle that makes air conditioning, or air cooling, possible. A basic refrigeration cycle consists of four major elements: a compressor, a condenser, a metering device and an evaporator. As a refrigerant passes through a circuit containing these four elements, air ...

  6. Georg Neumann - Wikipedia

    en.wikipedia.org/wiki/Georg_Neumann

    During the period from 1953 to 1956 Neumann introduced a series of small condenser microphones (KM 53, 54 and 56) especially for use in television broadcast studios. In 1957 they introduced the SM 2 microphone, which was essentially a pair of KM 56 microphones in a single body, arranged so that their directional patterns could be controlled ...

  7. Surface condenser - Wikipedia

    en.wikipedia.org/wiki/Surface_condenser

    An air-cooled condenser is however, significantly more expensive and cannot achieve as low a steam turbine exhaust pressure (and temperature) as a water-cooled surface condenser. Surface condensers are also used in applications and industries other than the condensing of steam turbine exhaust in power plants.