| 摘要 |
A rotatable ventilator hood having a full conical half portion, a forward conical portion and a wing portion connected together by standing seams internally of the hood. The wing portion includes a pair of wing walls extending downwardly at their connections to and below the termination of the forward portion, and a top portion integral with the wing walls, the top portion being inclined downwardly and being rounded in a plane perpendicular to the inclination thereof. One of the wing walls is larger in surface area than the other wing wall. Lubrication means are mounted to a brace member of the hood through which a stationary shaft extends for lubricating same during rotation of the hood thereon.
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