| 摘要 |
PURPOSE:To effect the ventilation efficiently and prevent the run-off of warm air in the house in winter by a method wherein the device is attached to the surface of a roofing and a lid, capable of being opened and closed from the inside of the house, is provided. CONSTITUTION:A box body 12, attached to the inclined surface R of the roofing, an opening 14, formed in the box body 12 and equipped with a non-return valve 18 communicating with the outdoor and facing downwardly, a net body 16, covering the opening 14, a hole 20, formed in the box body 12 and communicating with the garret, and a lid body 22, opening and closing the hole 20 by the operation from the inside of the house, are provided in the device. |
