Abstract: A door assembly comprising having a first side column positioned proximate a first side of a doorway and a second side column positioned proximate a second side of the doorway. Each side column includes a pair of guide tracks forming a guide channel accessible from the doorway through a gap and a pair of guide track holders comprising a first guide track holder coupled to an exterior portion of a first guide track and a second guide track holder coupled to an exterior portion of a second guide track. Each guide track is made from a material more flexible than each guide track holder, and each guide track extends laterally a greater distance towards an interior of the doorway than each guide track holder.

Abstract: A door assembly having a door panel fixed proximate a top edge of the door panel to a drum, the drum being rotatable in a first direction and a second direction to wind or open and unwind or close the door panel. The door assembly includes a first side column and a second side column, each positioned proximate a doorway which is opened and closed by the door panel. Each side column includes a guide track positioned to guide one of the first vertical edge or the second vertical edge of the door panel as the door panel is moved. A first column of drive teeth is positioned along the first vertical edge and a second column of drive teeth positioned along the second vertical edge, wherein each of the first column of drive teeth and the second column of drive teeth are formed by a plurality of adjacent drive teeth, each drive tooth in each plurality of drive teeth abutting an adjacent drive tooth as the door panel is wound and unwound from the drum.