Insulated doors with restorable breakaway sections

A door for use at a doorway through a wall, the doorway having a height extending in a vertical direction between a floor and an upper edge of the doorway, the doorway having a width extending in a horizontal direction between a first lateral edge of the doorway and a second lateral edge of the doorway, the door comprising:

• an overhead track proximate the upper edge of the doorway, the overhead track being at a first elevation above the floor;
• a panel assembly suspended from the overhead track such that the overhead track carries most of a weight of the panel assembly, the overhead track guiding the panel assembly in translation along a path between an open position and a closed position relative to the doorway, the panel assembly blocking more of the doorway when the panel assembly is in the closed position than when the panel assembly is in the open position, the panel assembly having a normal configuration and a dislodged configuration, an entirety of the panel assembly lying within the path when the panel assembly is in the normal configuration, at least a portion of the panel assembly being displaced outside the path when the panel assembly is in the dislodged configuration, the panel assembly including a first side and a second side opposite the first side, the first and second sides extending generally parallel to the path when the panel assembly is in the normal configuration, the first side being closer to the wall than the second side;
• a lower track attached to at least one of the floor or the wall, the lower track being at a second elevation lower than the first elevation, the lower track being interposed between the wall and the panel assembly when the panel assembly is in the open position;
• and
• a spring cooperating with the lower track to urge the panel assembly towards the normal configuration as the panel assembly begins to move from the normal configuration towards the dislodged configuration, a longitudinal axis of the spring extending in a direction transverse to the path, the spring including a first end and a second end, the first end being closer to the wall than the second end, the second end being closer to the wall than the second side of the panel assembly.