| 摘要 |
An air vent for providing ventilation through a bore in a building structure, the air vent comprising a first body, which is located to a first, internal side of the building structure, a second body, which is located to a second, external side of the building structure and is coupled to the first body to provide a duct which extends through the building structure, and a cover unit, which is movably disposed within the second body between a first non- deployed position and a deployed position. |
