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  2. Attic fan - Wikipedia

    en.wikipedia.org/wiki/Attic_fan

    Attic fans are typically used in warmer months, when temperatures in an attic can exceed 120 °F (49 °C). A fan may be installed in an attic for the different purpose of cooling a whole house, venting hot air out via the attic; such fans are often called whole-house fans. Wind-powered roof turbine ventilator. Mechanical attic ventilation fans ...

  3. Whole-house fan - Wikipedia

    en.wikipedia.org/wiki/Whole-house_fan

    A whole house fan is a type of fan, commonly venting into a building's attic, designed to circulate air in an entire house or other building. The fan removes hot air from the building and draws in cooler outdoor air through windows and other openings. While sometimes referred to as an "attic fan", it is not to be confused with a powered attic ...

  4. Centrifugal fan - Wikipedia

    en.wikipedia.org/wiki/Centrifugal_fan

    Figure 1: Components of a centrifugal fan An external motor belt driven inline centrifugal fan discharging inline to the exterior of a building through a duct. Unlike non-inline/non-concentric impeller casing design with a cutoff blade above, the concentrically symetric cylinder casing and impeller geometry of inline type redirects the outflow around so that it is parallel to the inflow of gases.

  5. Heating, ventilation, and air conditioning - Wikipedia

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

    HVAC ventilation exhaust for a 12-story building An axial belt-drive exhaust fan serving an underground car park. This exhaust fan's operation is interlocked with the concentration of contaminants emitted by internal combustion engines. Mechanical, or forced, ventilation is provided by an air handler (AHU) and used to control indoor air quality.

  6. Line shaft - Wikipedia

    en.wikipedia.org/wiki/Line_shaft

    Four wool spinning machines driven by belts from an overhead lineshaft (Leipzig, Germany, circa 1925) The belt drives of the Mueller Mill, model and reality, in motionA line shaft is a power-driven rotating shaft for power transmission that was used extensively from the Industrial Revolution until the early 20th century.

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  9. Was the Six Triple Eight Real? All About the History-Making ...

    www.aol.com/lifestyle/six-triple-eight-real...

    Kerry Washington portrays Lt. Col. Charity Adams in the Netflix film. The real-life leader was born in Kittrell, N.C., on Dec. 5, 1918, and raised in Columbia, S.C.

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