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Joseph Wallis
Joe Wallis
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Individual
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3960. Wallis, J., and Wallis, J. Feb. 17. Ventilators.-An outlet ventilator consists of a casing A in which is provided a shaft communicating by an aperture b with the inside of the building &c., and also shafts f, g, communicating with the interior by openings i. The outer casing is cut away at e so that wind &c. passing through the casing is deflected through the passages d and draws off foul air through the openings c, h in the shafts. When the casing A is made of sheet metal, the shafts f, g are formed by cutting and bending inwards portions of the sides, leaving openings e.
GB190603960D1906-02-171906-02-17Improvements in Ventilators.
ExpiredGB190603960A
(en)