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2. Register (air and heating) - Wikipedia

   en.wikipedia.org/wiki/Register_(air_and_heating)

   A register is a grille with moving parts, capable of being opened and closed and the air flow directed, which is part of a building's heating, ventilation, and air conditioning (HVAC) system. The placement and size of registers is critical to HVAC efficiency. Register dampers are also important, and can serve a safety function.

3. Gas burner - Wikipedia

   en.wikipedia.org/wiki/Gas_burner

   Gas / Fuels Flame temperature Propane in air : 1980 °C 3596 °F Butane in air : 1970 °C 3578 °F Wood in air (normally not reached in a wood stove) : 1980 °C 3596 °F ...

4. Forced-air - Wikipedia

   en.wikipedia.org/wiki/Forced-air

   The return plenum carries the air from several large return grills (vents) to a central air handler for re-heating. The supply plenum directs air from the central unit to the rooms which the system is designed to heat.

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   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

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7. U.S. Elections - Latest News and Updates on ... - AOL

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   Get the latest updates on the U.S. Elections. Stay informed with fast facts, candidate updates, and key takeaways on the issues, all in one place.