Flexible strip curtain doors are often used in doorways or openings to keep warm or cool air inside enclosed areas. One problem with such strip curtain door installations is that even in a closed position, these doors allow substantial amounts of wind to pass through the doorways. This is particularly true of the lower inboard regions or corners of cooperating pairs of doors. These regions are unsupported and tend to curl or swingingly incline outboard and out of the plane of the doorway in response to wind impinging upon the doors. Consequently, wind blows between the opening created by the curled lower inboard corners thereby allowing unwanted heat transfer from within the enclosed area to the outside or vice versa.
An alternative to using the strip curtain doors is to use standard rigid doors which either slide or swing into place to close the opening in the enclosed area. These doors work well as long as the doors are opened and closed to accommodate vehicles passing through their doorways or openings. In the event a sensor or an actuator responsible for opening and closing the door fails, a vehicle may strike the doors causing damage to either the vehicle, the doors or both.
The present invention addresses these shortcomings of conventional strip curtain doors and conventional rigid doors.