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  2. Vacuum furnace - Wikipedia

    en.wikipedia.org/wiki/Vacuum_furnace

    Vacuum furnaces are used to carry out processes such as annealing, brazing, sintering and heat treatment with high consistency and low contamination. Characteristics of a vacuum furnace are: Uniform temperatures in the range. 800–3,000 °C (1,500–5,400 °F) Commercially available vacuum pumping systems can reach vacuum levels as low as 1 × ...

  3. 25 of the best Walmart sales of the week: Apple gadgets ... - AOL

    www.aol.com/lifestyle/the-best-walmart-sales-of...

    Rapidly and efficiently heat small spaces throughout your home with this small ceramic fan heater. The easy-to-use thermostat control allows you to set the perfect temperature with peace of mind ...

  4. Heat treating - Wikipedia

    en.wikipedia.org/wiki/Heat_treating

    Heat treating furnace at 1,800 °F (980 °C) Heat treating (or heat treatment) is a group of industrial, thermal and metalworking processes used to alter the physical, and sometimes chemical, properties of a material. The most common application is metallurgical. Heat treatments are also used in the manufacture of many other materials, such as ...

  5. Thousands of space heaters sold on Amazon recalled for ...

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    A space heater sold on Amazon is being recalled due to the potential to cause an "electric shock," resulting in a fire hazard, the U.S. Consumer Product Safety Commission (CPSC) announced Thursday ...

  6. Heat recovery ventilation - Wikipedia

    en.wikipedia.org/wiki/Heat_recovery_ventilation

    By recovering the residual heat in the exhaust gas, the fresh air introduced into the air conditioning system is preheated (or pre-cooled) before it enters the room, or the air cooler of the air conditioning unit performs heat and moisture treatment. [1] A typical heat recovery system in buildings comprises a core unit, channels for fresh and ...

  7. The best air purifiers of 2025 - AOL

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    We put the best air purifiers from Lenovo, Honeywell, Winix, and more to the test to see which held up best (and actually purified the air for you). See what our product scientist has to say.

  8. Central heating - Wikipedia

    en.wikipedia.org/wiki/Central_heating

    Electric heating or resistance heating converts electricity directly to heat. Electric heat is often more expensive than heat produced by combustion appliances like natural gas, propane, and oil. Electric resistance heat can be provided by baseboard heaters, space heaters, radiant heaters, furnaces, wall heaters, or thermal storage systems.

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