A door assembly for covering an opening, the door assembly including: a curtain supported at a first end of the opening, the curtain including a first lateral edge supporting at least one first curtain magnetic device; and a first track portion extending along a first opening side of the opening between the first end and an opposing second end, the first track portion including at least one first magnetic assembly, wherein the first curtain magnetic device is configured to magnetically couple with the first magnetic assembly of the first track portion such that the curtain is magnetically supported at the first lateral edge of the curtain, characterized in that the first track portion includes: a first track wall supporting a first track magnetic device of the first magnetic assembly; and a second track wall spaced apart from the first track wall to define a channel between the first track wall and the second track wall, the second track wall supporting a second track magnetic device of the first magnetic assembly and wherein the first lateral edge of the curtain extends between the first track magnetic device and the second track magnetic device into the channel such that the first curtain magnetic device is magnetically coupled with the first track magnetic device and the second track magnetic device. a curtain supported at a first end of the opening, the curtain including a first lateral edge supporting at least one first curtain magnetic device; and a first track portion extending along a first opening side of the opening between the first end and an opposing second end, the first track portion including at least one first magnetic assembly, wherein the first curtain magnetic device is configured to magnetically couple with the first magnetic assembly of the first track portion such that the curtain is magnetically supported at the first lateral edge of the curtain, characterized in that the first track portion includes: a first track wall supporting a first track magnetic device of the first magnetic assembly; and a second track wall spaced apart from the first track wall to define a channel between the first track wall and the second track wall, the second track wall supporting a second track magnetic device of the first magnetic assembly and wherein the first lateral edge of the curtain extends between the first track magnetic device and the second track magnetic device into the channel such that the first curtain magnetic device is magnetically coupled with the first track magnetic device and the second track magnetic device. a first track wall supporting a first track magnetic device of the first magnetic assembly; and a second track wall spaced apart from the first track wall to define a channel between the first track wall and the second track wall, the second track wall supporting a second track magnetic device of the first magnetic assembly and wherein the first lateral edge of the curtain extends between the first track magnetic device and the second track magnetic device into the channel such that the first curtain magnetic device is magnetically coupled with the first track magnetic device and the second track magnetic device.