| 摘要 |
A door assembly having a multi-panel door connected to a casing that is inserted into a structure opening. The multi-panel door can be operated by a control assembly operatively coupled to the casing and the multi-panel door. The multi-panel door can be a bi-fold door having an upper panel and lower panel operatively coupled together. The upper panel can be pivotally coupled to the casing at one end and pivotally coupled to a portion of the lower panel at its other end. The control assembly can control movement of the door between an open position and a closed position.
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