| 摘要 |
A device for automatic ventilation of buildings comprises an elongated cap (1) with openings for exhaustion of exhaust air from the interior of the building. In addition to a bottom part (4) wit h at least one hole (9) for connection of an exhaustion pipe (10) for waste-air, the cap comprises an upper part (5) in the form of an arched, cross section-wise curved cover sheet, which in a highest located apex portion (6) has one or more long narrow, longitudinal slit openings (7) in which a driving negative air-pressure is provided when the wind sweeps forwards along the arched top side of the sheet. |
