US Patent 9194178 Door for industrial building

A door assembly for covering an opening includes a curtain supported at a first end of the opening. The curtain includes a first lateral edge supporting at least one first curtain magnetic device. The door assembly includes 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 includes at least one first magnetic assembly. The first curtain magnetic device magnetically couples 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.