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2. Central vacuum cleaner - Wikipedia

   en.wikipedia.org/wiki/Central_vacuum_cleaner

   In fixed-installation central vacuum cleaners, the cleaned air may be exhausted directly outside without the need for further filtration. A well-designed cyclonic separation system does not lose suction power due to airflow restriction until the collection vessel is almost full.

3. List of vacuum cleaners - Wikipedia

   en.wikipedia.org/wiki/List_of_vacuum_cleaners

   An early electric vacuum cleaner by the Electric Suction Sweeper Company, circa 1908, predecessor of the Hoover vacuum cleaner (1922).. This is a list of vacuum cleaners and robot vacuum cleaner manufacturers.

4. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Central, "all-air" air-conditioning systems (or package systems) with a combined outdoor condenser/evaporator unit are often installed in North American residences, offices, and public buildings, but are difficult to retrofit (install in a building that was not designed to receive it) because of the bulky air ducts required. [32] (Minisplit ...

5. 'This baby does the job': Amazon's No. 1 bestselling car vac ...

   www.aol.com/lifestyle/today-only-amazing-car-vac...

   For premium support please call: 800-290-4726 more ways to reach us

6. David Oreck - Wikipedia

   en.wikipedia.org/wiki/David_Oreck

   It came with the abandoned design for an upright vacuum cleaner by Whirlpool, a business RCA had a shareholding in. However, Whirlpool's largest customer, Sears was concerned the arrangement would compete with them so in 1963, Oreck and his brother Marshall set up Oreck Corporation to independently sell his own vacuum cleaners by mail order. [5]

7. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   Not all central heating systems require purchased energy. A few buildings are served by local geothermal heat, using hot water or steam from a local well to provide building heat. Such areas are uncommon. A passive solar system requires no purchased fuel but needs to be carefully designed for the site.

8. News, Politics, Sports, Mail & Latest Headlines - AOL.com

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   Get breaking news and the latest headlines on business, entertainment, politics, world news, tech, sports, videos and much more from AOL

9. High-voltage direct current - Wikipedia

   en.wikipedia.org/wiki/High-voltage_direct_current

   Long distance HVDC lines carrying hydroelectricity from Canada's Nelson River to this converter station where it is converted to AC for use in southern Manitoba's grid. A high-voltage direct current (HVDC) electric power transmission system uses direct current (DC) for electric power transmission, in contrast with the more common alternating current (AC) transmission systems. [1]