| abstract |
Provided are door systems having a plurality of door panels and a frame, the door panels being movable horizontally between an extended position closing an opening in a building structure, and a folded retracted position opening the opening in the building structure. When in the extended position, the door panels interlock with each other forming a barrier to wind, dirt, dust and insects. The frame is movably attached to the building structure and when the door panels are in the extended position, the frame moves and engages the door panels with a sealing member to provide an airtight seal of the opening in the building structure. |