A door assembly including a door frame, a door coupled to the door frame such that the door is pivotable between an open position and a closed position, and a seal attached to one of the door or the door frame for providing a seal between the door and the door frame, wherein the seal has an inactive phase and an active phase providing superior sealing to the inactive phase, and wherein movement of the door from the open position to the closed position results in the seal changing from the inactive phase to the active phase.