Balancing strip collector for retractable curtain

A door assembly positionable about a structure opening in a structure wall, the door assembly comprising:

• a rotatable curtain deployment member having a longitudinal axis and positionable about the structure opening;
• a curtain panel having a first end fixed to the curtain deployment member, and a free end, the free end being movable in a moveable direction, upon rotation of the curtain deployment member, between a retracted position where the structure opening is at least partially uncovered, and an extended position where the curtain panel covers at least a portion of the structure opening, the curtain panel having at least one portion of increased thickness aligned with a location on the curtain deployment member, the at least one portion of increased thickness extending in the moveable direction over at least a portion of the curtain panel;
• a rotatable balancing strip member having a longitudinal axis and a length, at least a portion of the length being longitudinally coextensive with the curtain deployment member, the balancing strip member configured to be mounted about the structure opening in a substantially parallel arrangement with the curtain deployment member, the balancing strip member being engaged with the curtain deployment member so as to rotate synchronously, with the curtain deployment member, and
• a balancing strip having a first end attached to the balancing strip member, and a second end attached to the curtain deployment member, the balancing strip having an axial width that is less than the axial width of the curtain panel, and being axially spaced from the at least one portion of increased thickness,
• wherein upon synchronous movement of the balancing strip member and curtain deployment member in a direction to deploy the curtain panel into the retracted position, at least a portion of the balancing strip deploys from the balancing strip member to the curtain deployment member, and
• wherein upon synchronous movement of the balancing strip member and curtain deployment member to deploy the curtain panel to the extended position, the portion of the balancing strip deploys from the curtain deployment member to the balancing strip member.