| 摘要 |
A damage minimizing closure door (10) moveable vertically between open and closed positions wherein the closure door is a continuous flexible curtain (12). In one embodiment, the curtain includes a rigid bottom bar (22) that is releasably connected to guide structures (20) adjacent a door opening. The side edges of the curtain may separate from the guide structures (20) upon being impacted by an externally applied force. During relatively high wind pressure or differential pressure conditions across the door, causing the flexible curtain (12) to tend to billow or move transversely in directions into and away from the door opening, frictional contact develops between the faces of the curtain and the guide structures as well as between a wind bar (48) and windstrip (46, 460, 461) associated with the door and guide structures. The rigidity of the bottom bar (22) tied into the guide channel structures reduces this effect of friction, thus easing the upward and downward movement of the door within the guide structures. The windstrips (46, 460, 461) may be discontinuous and the releasable bottom bar (48) may be omitted or substituted with a bottom bar (220) that is not interconnected with the guide structures (20).
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