Patent ID: 8656979

Claim:
In a sliding door system having a sliding door, a screen door, and a pet door panel, each of the sliding door, screen door and pet door panel being disposed within a door frame, the sliding door being adapted to translate within a sliding door plane and the screen door being adapted to translate within a screen door plane, the sliding door plane being disposed parallel with the screen door plane and having a gap extending therebetween, and the pet door panel being fixed within the sliding door plane at a side adjacent to the sliding door, an improvement comprising: a flange configured to seal the gap between the pet door panel and the screen door for preventing entry of unwanted pests and debris therethrough, the flange comprising: a base extending from a bottom end to a top end along a length of the flange, a cross-section of the base having a triangular shape, the base being configured to attach with at least one surface of the pet door panel; and a body portion extending outwardly from the base and configured to abut the screen door, the body portion comprising an arced surface for increased rigidity and improved contact with the screen door.