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2. Drain-waste-vent system - Wikipedia

   en.wikipedia.org/wiki/Drain-waste-vent_system

   A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.

3. Air lock - Wikipedia

   en.wikipedia.org/wiki/Air_lock

   They may also be designed to let air in under vacuum. There are many other design considerations for design of water pipeline systems, e.g. [1] [clarification needed] 'S' trap inlet to drain. The air lock phenomenon can be used in a number of useful ways. The adjacent diagram shows an 'S' trap.

4. Water heat recycling - Wikipedia

   en.wikipedia.org/wiki/Water_heat_recycling

   Installation of a double-walled copper-on-copper heat exchanger in a vertical section of the master drain line in a Canadian home (2007) Water heat recycling (also known as drain water heat recovery, waste water heat recovery, greywater heat recovery, [citation needed] or sometimes shower water heat recovery [citation needed]) is the use of a heat exchanger to recover energy and reuse heat ...

5. AOL Mail - AOL Help

   help.aol.com/products/aol-webmail

   Get answers to your AOL Mail, login, Desktop Gold, AOL app, password and subscription questions. Find the support options to contact customer care by email, chat, or phone number.

6. 4 planes collide in 2 separate tarmac crashes at Boston Logan ...

   www.aol.com/news/4-planes-collide-2-separate...

   An already hectic holiday travel day was made more chaotic with two separate plane collisions on the tarmac at Boston Logan International Airport just hours apart on Monday.

7. LG Electronics - Wikipedia

   en.wikipedia.org/wiki/LG_Electronics

   LG was also an official supplier to Virgin Racing and Lotus Racing team, plus engine manufacturer Cosworth from 2010 to 2012. [88] LG also sponsors London Fashion Week and the LG Arena in Birmingham. [89] During the period 2001–2003, LG sponsored the snooker Grand Prix. During these years the tournament was known as the LG Cup. In 2008, LG ...

8. Kids need free play to stay healthy, and they're not getting ...

   www.aol.com/kids-free-play-stay-healthy...

   “The ability for kids to adapt and have fun … we just mess it up a lot of time.” The words are from Jeff Francoeur, a former standout major league outfielder.

9. Why Kate and Oliver Hudson turned down Kurt Russell's ...

   www.aol.com/news/why-kate-oliver-hudson-turned...

   Kurt Russell, Goldie Hawn, Oliver Hudson, Wyatt Russell, Kate Hudson, Don Johnson and Melanie Griffith on April 14, 1990 in Long Beach, California.