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Screw-ven′ti-lator.

A ventilating apparatus in the form of a screw, which is rotated by the passing current of heated air. It can hardly be said to be a mechanical ventilator, as it is only operated by the air in the discharge-aperture and does not drive the air through. It may be so arranged as only to rotate in one direction, and thus to impede the back passage of air while it yields to its discharge.

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