| 20120021680 | VENTILATOR WITH ROTATING CYLINDER - A ventilation device for a building is provided. The ventilation device includes a pair of frame elements spaced a distance from each other to define a free passage extending between an inside of the building and an outside of the building in a clearance defined by the distance. A rotating cylinder is positioned within the clearance and is configured to rotate between a closed position in which the rotating cylinder substantially completely seals the free passage and an opened position in which the rotating cylinder substantially completely opens the free passage. At least two seals are configured to substantially completely seal the rotating cylinder at least at each frame element of the pair of frame elements in the closed position. | 01-26-2012 |
