A door seal system configured to be operatively coupled with a top-hanging sliding door, the top-hanging sliding door comprising a door frame which supports a door panel that is slideable between an open position and a closed position, the door seal system comprising: a drop seal assembly configured to be physically coupled to a bottom portion of the door panel, the drop seal assembly including an elongated carriage having an elastic seal disposed on a bottom side thereof which operatively faces a floor surface below the door panel, the carriage being vertically movable between a raised position wherein the elastic seal is spaced apart from the floor surface, and a lowered position wherein the elastic seal is in contact with the floor surface, and wherein the carriage is biased in the raised position and vertically movable from the raised position to the lowered position responsive to an external horizontal force applied to the carriage; a drop seal assembly activator configured to be physically coupled to the door frame of the top-hanging sliding door, wherein in operation the drop seal assembly activator is configured to impart the horizontal force on the carriage as the door panel is moved from the open position toward the closed position to cause the carriage of the drop seal assembly to move from the raised position to the lowered position; characterized in that the carriage of the drop seal assembly comprises a fixed pin, and in that the drop seal assembly further comprises an elongated guide bar which is configured to be fixed relative to the door panel, the guide bar includes an angled slot therein which receives the fixed pin of the carriage, and the fixed pin rides in the angled slot responsive to the horizontal force imparted on the carriage by the drop seal assembly activator to control movement of the carriage between the raised position and the lowered position. a drop seal assembly configured to be physically coupled to a bottom portion of the door panel, the drop seal assembly including an elongated carriage having an elastic seal disposed on a bottom side thereof which operatively faces a floor surface below the door panel, the carriage being vertically movable between a raised position wherein the elastic seal is spaced apart from the floor surface, and a lowered position wherein the elastic seal is in contact with the floor surface, and wherein the carriage is biased in the raised position and vertically movable from the raised position to the lowered position responsive to an external horizontal force applied to the carriage; a drop seal assembly activator configured to be physically coupled to the door frame of the top-hanging sliding door, wherein in operation the drop seal assembly activator is configured to impart the horizontal force on the carriage as the door panel is moved from the open position toward the closed position to cause the carriage of the drop seal assembly to move from the raised position to the lowered position; characterized in that the carriage of the drop seal assembly comprises a fixed pin, and in that the drop seal assembly further comprises an elongated guide bar which is configured to be fixed relative to the door panel, the guide bar includes an angled slot therein which receives the fixed pin of the carriage, and the fixed pin rides in the angled slot responsive to the horizontal force imparted on the carriage by the drop seal assembly activator to control movement of the carriage between the raised position and the lowered position.