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  2. 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.

  3. Fan (machine) - Wikipedia

    en.wikipedia.org/wiki/Fan_(machine)

    Five-blade or six-blade designs are rare. The materials from which the components are made, such as brass, are important factors in fan desirability. A ceiling fan is a fan suspended from the ceiling of a room. Most ceiling fans rotate at relatively low speeds and do not have blade guards because they are inaccessible and unwieldy.

  4. Multiway switching - Wikipedia

    en.wikipedia.org/wiki/Multiway_switching

    In contrast to a simple light switch, which is a single pole, single throw (SPST) switch, multiway switching uses switches with one or more additional contacts and two or more wires are run between the switches. When the load is controlled from only two points, single pole, double throw (SPDT) switches are used.

  5. Heating, ventilation, and air conditioning - Wikipedia

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

    In summer, ceiling fans and table/floor fans circulate air within a room for the purpose of reducing the perceived temperature by increasing evaporation of perspiration on the skin of the occupants. Because hot air rises, ceiling fans may be used to keep a room warmer in the winter by circulating the warm stratified air from the ceiling to the ...

  6. DIN 72552 - Wikipedia

    en.wikipedia.org/wiki/DIN_72552

    flasher unit out, indicator switch in 54L, S, S4, L 49b out 2. flasher circuit 49c out 3. flasher circuit C 1st flasher indicator light K, K1, P C2 2nd flasher indicator light K1, K2, K3, K4 C3 3rd flasher indicator light K3, K4 L indicator lights left HL, L54, VL R indicator lights right HR, R54, VR L54 lights out, left SBL R54 lights out, right

  7. Air conditioning - Wikipedia

    en.wikipedia.org/wiki/Air_conditioning

    Residential central air systems are usually from 1 to 5 tons (3.5 to 18 kW) in capacity. [ citation needed ] The efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER), which is defined by the Air Conditioning, Heating and Refrigeration Institute in its 2008 standard AHRI 210/240, Performance Rating of ...

  8. Knife switch - Wikipedia

    en.wikipedia.org/wiki/Knife_switch

    1917 motor switch, with extra contacts Dual-pole, dual-throw knife switch in one of its two closed positions. A knife switch is a type of switch used to control the flow of electricity in a circuit. It is composed of a hinge which allows a metal lever, or knife, to be lifted from or inserted into a slot or jaw.

  9. Airbus A350 - Wikipedia

    en.wikipedia.org/wiki/Airbus_A350

    The Airbus A350 is a long-range, wide-body twin-engine airliner developed and produced by Airbus.The initial A350 design proposed in 2004, in response to the Boeing 787 Dreamliner, would have been a development of the Airbus A330 with composite wings and new engines.