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2. Drain-waste-vent system - Wikipedia

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

   In the U.S., every plumbing fixture must also be coupled to the system's vent piping. [1] Without a vent, negative pressure can slow the flow of water leaving the system, resulting in clogs, or cause siphonage to empty a trap. The high point of the vent system (the top of its "soil stack") must be open to the exterior at atmospheric pressure.

3. Heating, ventilation, and air conditioning - Wikipedia

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

   Electrical heaters are often used as backup or supplemental heat for heat pump systems. The heat pump gained popularity in the 1950s in Japan and the United States. [14] Heat pumps can extract heat from various sources, such as environmental air, exhaust air from a building, or from the ground. Heat pumps transfer heat from outside the ...

4. Exhaust heat recovery system - Wikipedia

   en.wikipedia.org/wiki/Exhaust_heat_recovery_system

   An exhaust heat recovery system turns waste heat energy in exhaust gases into electric energy for batteries or mechanical energy reintroduced on the crankshaft. The technology is of increasing interest as car and heavy-duty vehicle manufacturers continue to increase efficiency, saving fuel and reducing emissions.

5. Shop the best QVC Black Friday sales — including Oprah's ...

   www.aol.com/lifestyle/shop-the-best-qvc-black...

   Some of our favorite celebrity-endorsed items plus bestsellers — like a KitchenAid mixer for $99 off — are the hot deals to shop at QVC for Black Friday.

6. Shop the latest Trends and Deals - AOL.com

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   Get lifestyle news, with the latest style articles, fashion news, recipes, home features, videos and much more for your daily life from AOL.

7. All of these Black Friday deals would make very good gifts - AOL

   www.aol.com/lifestyle/all-of-these-black-friday...

   For little ones who already own a Toniebox starter set, there are lots of Tonies character bundles on sale right now that would make great stocking stuffers, like Marvel's Spidey & His Amazing ...