| 摘要 |
<p>The ventilation box has a housing (1) with an air output aperture and at least one ventilation tube (2) in the housing, connected to an air intake and containing a regulating flap. The air output aperture in the housing is covered by a bottom plate, consisting of a perforated plate (10) and a honeycomb insert (12). The jacket surfaces of the ventilation tube and the regulating flap are perforated. The ventilation tube is fitted with a closed bottom at the end of it inside the housing. The perforated plate is connected to the honeycomb inset on the output side. The honeycomb insert may have round or polygonal channels close against each other.</p> |
