Door assembly including a movable door with a flexible door panel

A door assembly for a vertical doorway opening comprising:

• a door movable between an open position and a closed position, said door comprising a flexible door panel having two opposed side edges and a lower horizontal panel edge, said flexible door panel being substantially horizontal in the open position and bendable along its horizontal axis;
• guide means for guiding said flexible door panel as it moves between a closed position and an open position, said guide means comprising a pair of opposed rotatable guide wheels near the top of each side of said doorway opening, the perimeters of said rotatable guide wheels contacting an inner surface of said flexible door panel near each of its two opposed side edges whereby said flexible door panel bends along its horizontal axis as the portions of the two opposed side edges contact the perimeter of said rotatable guide wheels, and said guide means further comprising a vertical U-shaped side frame extending downward from each of said rotatable guide wheels along each side of said doorway opening for slidably engaging the opposed side edges of the flexible door panel;
• and
• a horizontal strengthening strip pivotally connected to the lower horizontal panel edge of the flexible door panel, said lower horizontal panel edge being attached to an edge strip and said edge strip being pivotally engaged to the horizontal strengthening strip;
• and
• means for limiting the pivotal rotation between the horizontal strengthening strip and the edge strip to a predetermined angle of rotation.