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2. Industrial furnace - Wikipedia

   en.wikipedia.org/wiki/Industrial_furnace

   An industrial furnace, also known as a direct heater or a direct fired heater, is a device used to provide heat for an industrial process, typically higher than 400 degrees Celsius. [1] They are used to provide heat for a process or can serve as reactor which provides heats of reaction.

3. Furnace (central heating) - Wikipedia

   en.wikipedia.org/wiki/Furnace_(central_heating)

   However, the simplicity of single-stage gas furnaces come at the cost of blower motor noise and mechanical inefficiency. The blower motors on these single-stage furnaces consume more energy overall because, regardless of the heating requirements of the space, the fan and blower motors operate at a fixed-speed.

4. Flue - Wikipedia

   en.wikipedia.org/wiki/Flue

   A flue is a duct, pipe, or opening in a chimney for conveying exhaust gases from a fireplace, furnace, water heater, boiler, or generator to the outdoors. Historically the term flue meant the chimney itself. [1] In the United States, they are also known as vents for boilers and as breeching for water heaters and modern furnaces.

5. YouTube TV - Wikipedia

   en.wikipedia.org/wiki/YouTube_TV

   YouTube TV is an American subscription over-the-top streaming television service operated by YouTube, a subsidiary of Google, which in turn is a subsidiary of Alphabet Inc., who announced YouTube TV on February 28, 2017. [2]

6. The Hum - Wikipedia

   en.wikipedia.org/wiki/The_Hum

   A 1973 report cites a university study of fifty cases of people complaining about a "low throbbing background noise" that others were unable to hear. The sound, always peaking between 30 and 40 Hz (hertz), was found to only be heard during cool weather with a light breeze, and often early in the morning. These noises were often confined to a 10 ...

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   mail.aol.com

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8. Puddling (metallurgy) - Wikipedia

   en.wikipedia.org/wiki/Puddling_(metallurgy)

   The puddling furnace is a metalmaking technology used to create wrought iron or steel from the pig iron produced in a blast furnace. The furnace is constructed to pull the hot air over the iron without the fuel coming into direct contact with the iron, a system generally known as a reverberatory furnace or open hearth furnace. The major ...

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