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  3. Heating, ventilation, and air conditioning - Wikipedia

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    Electrical heaters are often used as backup or supplemental heat for heat pump systems. The heat pump gained popularity in the 1950s in Japan and the United States. [14] Heat pumps can extract heat from various sources, such as environmental air, exhaust air from a building, or from the ground. Heat pumps transfer heat from outside the ...

  4. Ceiling fan - Wikipedia

    en.wikipedia.org/wiki/Ceiling_fan

    A spinner fan with light kit A modern three blade spinner fan from India. Direct-drive ceiling fans employ a motor with a stationary inner core with a shell, made of cast iron, cast aluminum, or stamped steel, that revolves around it (commonly called a "spinner" motor). The blades are attached directly to this shell.

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  6. Cleanroom - Wikipedia

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    The yellow (red-green) lighting is necessary for photolithography, to prevent unwanted exposure of photoresist to light of shorter wavelengths. Cleanroom from outside Entrance to a cleanroom with no air shower Cleanroom for microelectronics manufacturing with fan filter units installed in the ceiling grid Cleanroom cabin for precision measuring ...

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  9. Solar combisystem - Wikipedia

    en.wikipedia.org/wiki/Solar_combisystem

    The remaining heat requirement is supplied by one or more auxiliary sources in order to maintain the heat supply once the solar heated water is exhausted. Such auxiliary heat sources may also use other renewable energy sources (when a geothermal heat pump is used, the combisystem is called geosolar) [2] and, sometimes, rechargeable batteries.

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