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  2. Grate heater - Wikipedia

    en.wikipedia.org/wiki/Grate_heater

    This tubular fireplace grate heater has a large surface area heat exchanger in a compact design, with a fan or blower (fans and blowers are not the same) to multiply the effect of natural convection. This is a very basic tubular blower that sits under a grate and heats the air being pumped through it from the heat of the coals.

  3. Rocket mass heater - Wikipedia

    en.wikipedia.org/wiki/Rocket_mass_heater

    The key principle is the incorporation of a large thermal mass built of masonry which absorbs heat from exhausting combustion products directed in a sinuous path through channels embedded in the masonry. [7] Construction base of a rocket stove (L-tube) DIY - Timelapse. Rocket stove Type: L-Tube. The first prototype was built in the 1980s.

  4. Fireplace - Wikipedia

    en.wikipedia.org/wiki/Fireplace

    Fireplace with tubular grate heater, with a high surface area in its heat exchanger and a lift out ash tray to simplify cleanup Some fireplace units incorporate a blower, which transfers more of the fireplace's heat to the air via convection , resulting in a more evenly heated space and a lower heating load.

  5. Fireplace fireback - Wikipedia

    en.wikipedia.org/wiki/Fireplace_fireback

    The primary functions of a fireback are to protect the wall at the back of the fireplace and radiate heat from the fire into the room. The protection was especially important where the wall was constructed of insubstantial material such as daub (a mud and straw mixture coating interwoven wooden wattles), brick or soft stone.

  6. UnitedHealth Group CEO: America’s health system is poorly ...

    www.aol.com/ceo-gunned-down-health-insurers...

    In his first public response to the consumer outcry following the fatal shooting of one of his top executives, UnitedHealth Group CEO Andrew Witty said Friday that the US health system “is not ...

  7. Radiant heating and cooling - Wikipedia

    en.wikipedia.org/wiki/Radiant_heating_and_cooling

    Radiant heating and cooling is a category of HVAC technologies that exchange heat by both convection and radiation with the environments they are designed to heat or cool. There are many subcategories of radiant heating and cooling, including: "radiant ceiling panels", [ 1 ] "embedded surface systems", [ 1 ] "thermally active building systems ...

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