| 摘要 |
A vent to be used for flood prevention which includes a frame provided with at least one aperture therein. The frame is further provided with means for covering the aperture and a receptacle for collection of fluid. The cover means is adapted to move between a first position where the aperture is open and a second position where the aperture is closed in response to the level of fluid within the receptacle. The cover means form a watertight seal with the frame when closed. Furthermore, the receptacle is provided with means to enable fluid to escape once a pre-determined fluid level is reached thereby allowing the cover means to move freely from one position to the other to open the aperture. |
