| 摘要 |
A ventilation appliance for rooms having a box-like housing which can be used either as a ventilator with a radial fan or a pressure differential ventilator without such a fan. The configuration of the applicance insures a good sound damping action even when only short flow path are available in the housing or when, for functional reasons, the housing cannot be lined with sound damping material. For this purpose and enveloping spiral 21 for the blower wheel of the radial fan is formed directly from a block-like insert body of sound damping material such a plastic foam or foam rubber, the enveloping spiral having formed thereon an approximately tangential and/or radially connecting air connecting conduit. A replaceable filter for such a ventilation device is disclosed. A possible explanation is indicated for an unexpectedly effective mixing of entering air with room air upon installation of such a ventilating appliance.
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