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An example of a horizontal side-moving door with a side-winding or horizontally translating curtain includes an upper seal comprising an upper edge of the curtain sliding within a groove of a seal guide. To protect the door in the event of an impact, at least a portion of the curtain's upper edge ca

An example of a horizontal side-moving door with a side-winding or horizontally translating curtain includes an upper seal comprising an upper edge of the curtain sliding within a groove of a seal guide. To protect the door in the event of an impact, at least a portion of the curtain's upper edge can restorably pull out from within the groove. To avoid damage in certain situations, the seal guide might resiliently deflect as well. After an impact, the curtain's upper edge is automatically fed back into the groove by simply opening and closing the door. During normal operation, the curtain's upper edge advantageously deflects in response to air pressure against either side of the door. In some examples, the seal guide is of a uniform cross-section, which makes the seal guide easy to manufacture by way of a conventional plastic extrusion process.

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1. A door for a wall defining a doorway with an upper edge and a lateral edge, wherein the door is horizontally movable between an open position and a closed position such that the door obstructs the doorway when the door is in the closed position, and the door exposes the doorway when the door is i

1. A door for a wall defining a doorway with an upper edge and a lateral edge, wherein the door is horizontally movable between an open position and a closed position such that the door obstructs the doorway when the door is in the closed position, and the door exposes the doorway when the door is in the open position, the door comprising: a track mountable in proximity with the upper edge of the doorway;a track follower mounted to the track for translation therealong;an elongate member extending downward from the track follower, the elongate member having a thickness defined by an outer dimension of the elongate member in a direction perpendicular relative to the doorway;a curtain that includes a leading edge and an upper edge, the leading edge is connected to the elongate member and is generally parallel thereto, the upper edge is generally perpendicular to the leading edge, the curtain having a thickness that is substantially thinner than the thickness of the elongate member, the curtain comprising a rear surface adjacent the doorway and a front surface opposite the rear surface; anda seal guide defining a seal groove extending in a substantially parallel relationship with the track so that the upper edge of the curtain protrudes into the seal groove and slides along the seal groove as the door opens and closes, the seal groove at least partially defined by a front seal portion enabled to seal along a portion of the front surface and a rear seal portion enabled to seal along a portion of the rear surface, at least one of the seal portions is positioned between the upper edge and a portion of the elongate member. 2. The door of claim 1, wherein the door is movable between an operative position and a dislodged position, the elongate member is forcibly movable from being generally vertical when the door is in the operative position to being appreciably inclined when the door is in the dislodged position, and the upper edge of the curtain includes a breakaway portion that is free to escape from within the seal groove as the door moves from the operative position to the dislodged position. 3. The door of claim 2, wherein the elongate member is pivotally coupled to the track follower such that when the door is in the dislodged position, the elongate member can pivot toward the doorway. 4. The door of claim 2, wherein the upper edge of the curtain includes a leading end that protrudes upward from the elongate member, and the leading end remains within the seal groove even when the door moves to the dislodged position. 5. The door of claim 2, wherein the seal guide defines a lead-in opening, wherein after the door moves from the operative position to the dislodged position, the lead-in opening automatically guides the breakaway portion of the curtain's upper edge back into the seal groove as the door moves from the open position to the closed position. 6. The door of claim 1, wherein the seal guide is above an upper end of the elongate member. 7. The door of claim 1, wherein the upper edge is an integral extension of the curtain, whereby the curtain and the upper edge comprises a unitary piece. 8. The door of claim 1, wherein the seal guide is resiliently flexible such that the seal guide can resiliently deflect in response to pivotal movement of the elongate member. 9. The door of claim 1, further comprising: an arm that includes an anchored end that is substantially stationary and a distal end; anda movable connection coupling the seal guide to the distal end of the arm, whereby the seal guide can move relative to the distal end. 10. The door of claim 9, wherein at least one of the distal end and the seal guide defines a slot at the movable connection. 11. The door of claim 9, further comprising a resilient member extending between the distal end and the seal guide, wherein the resilient member urges the seal guide toward the elongate member. 12. The door of claim 1, further comprising an arm that includes an anchored end that is substantially stationary and a distal end to which the seal guide is mounted, wherein the arm is resiliently flexible to enable the seal guide to move. 13. The door of claim 1, further comprising: a roller extending vertically and being mountable in proximity with the lateral edge of the doorway, wherein the curtain wraps around the roller such that the roller selectively takes in and pays out the curtain as the door moves between its open position and closed position respectively; anda spring coupled to the roller such that the spring urges the roller to take in the curtain. 14. The door of claim 1, wherein the contacting seal portion is a brush seal. 15. The door of claim 1, wherein the seal groove comprises a brush groove and at least one seal portion comprises a brush. 16. A door for a wall defining a doorway with an upper edge and a lateral edge, wherein the door is horizontally movable between an open position and a closed position such that the door obstructs the doorway when the door is in the closed position, and the door exposes the doorway when the door is in the open position, the door comprising: a track mountable in proximity with the upper edge of the doorway;a track follower mounted to the track for translation therealong;an elongate member extending downward from the track follower to travel therewith to define a path of travel;a curtain that includes a leading edge and an upper edge, the leading edge is connected to the elongate member and is generally parallel thereto, the upper edge is generally perpendicular to the leading edge, the curtain is more flexible than the elongate member, the curtain to at least partially obstruct the doorway when the door is in the closed position;a seal guide defining a seal groove and positioned in laterally-spaced relation to the path of travel of the elongate member so that the upper edge of the curtain protrudes into the seal groove and slides along the seal groove as the door opens and closes, a groove into which a portion of the seal guide extends at least partially defined between the upper edge and the elongate member; andtwo contacting seal member portions at least partially defining the seal groove, wherein the two contacting seal member portions are able to contact a rear surface and a front surface of the upper edge of the curtain. 17. The door of claim 1, wherein the elongate member comprises a first region, and a second region, the first region being positioned adjacent the seal guide and being thinner than the second region. 18. The door of claim 17, further comprising a transition region of the elongate member between the first region and the second region. 19. The door of claim 18, wherein the curtain extends above the transition region. 20. The door of claim 1, wherein the seal guide is mounted from one side of the curtain. 21. The door of claim 1, wherein the seal portions oppose one another and are coupled together by a central portion of the seal guide. 22. The door of claim 1, wherein the seal guide comprises a unitary member. 23. The door of claim 1, wherein the seal guide extends across the upper edge. 24. A door for a wall defining a doorway with an upper edge and a lateral edge, wherein the door is horizontally movable between an open position and a closed position such that the door obstructs the doorway when the door is in the closed position, and the door exposes the doorway when the door is in the open position, the door comprising: a track mountable in proximity with the upper edge of the doorway;a track follower mounted to the track for translation therealong;an elongate member extending downward from the track follower, the elongate member comprising a first portion having a first thickness and a second portion having a second thickness, the second thickness being thicker than the first thickness, the first portion to be positioned between the track follower and the second portion;a curtain comprising a leading edge and an upper edge, the leading edge being coupled to the elongate member, the upper edge being substantially perpendicular to the leading edge; anda seal guide defining a seal groove positioned to enable the upper edge of the curtain to protrude into the seal groove and slide along the seal groove as the door opens and closes, a portion of the seal guide being positioned in a groove at least partially defined by the upper edge of the curtain and the first portion of the elongate member to enable a surface of the curtain to seal with the seal guide and enable the elongate member to be moveable between the open and closed positions.