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 for Fan wheel
From The Collaborative International Dictionary of English v.0.48 :

  Fan \Fan\ (f[a^]n), n. [AS. fann, fr. L. vannus fan, van for
     winnowing grain; cf. F. van. Cf. Van a winnowing machine,
     1. An instrument used for producing artificial currents of
        air, by the wafting or revolving motion of a broad
        surface; as:
        (a) An instrument for cooling the person, made of
            feathers, paper, silk, etc., and often mounted on
            sticks all turning about the same pivot, so as when
            opened to radiate from the center and assume the
            figure of a section of a circle.
        (b) (Mach.) Any revolving vane or vanes used for producing
            currents of air, in winnowing grain, blowing a fire,
            ventilation, etc., or for checking rapid motion by the
            resistance of the air; a fan blower; a fan wheel.
        (c) An instrument for winnowing grain, by moving which the
            grain is tossed and agitated, and the chaff is
            separated and blown away.
        (d) Something in the form of a fan when spread, as a
            peacock's tail, a window, etc.
        (e) A small vane or sail, used to keep the large sails of
            a smock windmill always in the direction of the wind.
            [1913 Webster]
                  Clean provender, which hath been winnowed with
                  the shovel and with the fan.      --Is. xxx. 24.
            [1913 Webster]
     2. That which produces effects analogous to those of a fan,
        as in exciting a flame, etc.; that which inflames,
        heightens, or strengthens; as, it served as a fan to the
        flame of his passion.
        [1913 Webster]
     3. A quintain; -- from its form. [Obs.] --Chaucer.
        [1913 Webster]
     Fan blower, a wheel with vanes fixed on a rotating shaft
        inclosed in a case or chamber, to create a blast of air
        (fan blast) for forge purposes, or a current for draft and
        ventilation; a fanner.
     Fan cricket (Zool.), a mole cricket.
     Fan light (Arch.), a window over a door; -- so called from
        the semicircular form and radiating sash bars of those
        windows which are set in the circular heads of arched
     Fan shell (Zool.), any shell of the family Pectinid[ae].
        See Scallop, n., 1.
     Fan tracery (Arch.), the decorative tracery on the surface
        of fan vaulting.
     Fan vaulting (Arch.), an elaborate system of vaulting, in
        which the ribs diverge somewhat like the rays of a fan, as
        in Henry VII.'s chapel in Westminster Abbey. It is
        peculiar to English Gothic.
     Fan wheel, the wheel of a fan blower.
     Fan window. Same as Fan light (above).
     electric fan. a fan having revolving blades for propelling
        air, powered by an electric motor.
        [1913 Webster]

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