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2. Heating, ventilation, and air conditioning - Wikipedia

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

   The fan enclosure is directly behind the board, and the filters can be seen at the top. The safety interlock switch is at the bottom left. In the lower middle is the capacitor. Heating, ventilation, and air conditioning (HVAC) is the use of various technologies to control the temperature, humidity, and purity of

3. Compressibility factor - Wikipedia

   en.wikipedia.org/wiki/Compressibility_factor

   A graphical representation of the behavior of gases and how that behavior relates to compressibility factor. The compressibility factor is defined in thermodynamics and engineering frequently as:

4. Vacuum cleaner - Wikipedia

   en.wikipedia.org/wiki/Vacuum_cleaner

   Cleveland's P.A. Geier Company had obtained a patent on a cyclonic vacuum cleaner as early as 1928, which was later sold to Health-Mor in 1939, introducing the Filter Queen cyclonic canister vacuum cleaner. [31] In 1979, James Dyson introduced a portable unit with cyclonic separation, adapting this design from industrial saw mills. [32]

5. 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

6. Computer cooling - Wikipedia

   en.wikipedia.org/wiki/Computer_cooling

   Fans are used when natural convection is insufficient to remove heat. Fans may be fitted to the computer case or attached to CPUs, GPUs, chipsets, power supply units (PSUs), hard drives, or as cards plugged into an expansion slot. Common fan sizes include 40, 60, 80, 92, 120, and 140 mm. 200, 230, 250 and 300 mm fans are sometimes used in high ...

7. AOL Mail

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   AOL Mail offers a secure and user-friendly email service with spam protection, folders, keyboard shortcuts and more.