| 摘要 |
A circular or polygonal diffuser for ventilating systems, comprising an annular outer diffuser cone or pyramid adapted to be fixedly mounted in a ceiling of a room to be ventilated, and an inner diffuser cone or pyramid assembly which includes at least one diffuser cone or pyramid of smaller dimensions than the outer diffuser cone or pyramid and which is connected to the outer cone or pyramid for axial adjustment relative thereto by means of parallelogram linkage devices having friction inducing means serving to retain the inner cone or pyramid assembly in the adjusted position.
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