Patent ID: 7451714

Claim:
A gasket comprising: an elongated silicone rubber member having a ridged rectangular cross-section for mounting to a gasket retainer and a door frame, the ridged rectangular cross-section comprising: a back side with a first end and a second end; a front side with a first end and a second end; a first side extending from the first end of the back side to the first end of the front side; a second side extending from the second end of the back side to the second end of the front end; and a ridged portion protruding from the front side, wherein the back side, the front side, the first side, and the second side are for contacting inner walls of the gasket retainer, and the ridged portion is for contacting a knife edge of the door frame; and an elongated crush zone within the elongated silicone rubber member formed substantially adjacent to a surface of the ridged portion of the elongated silicone rubber member; and wherein the gasket further comprises an elongated intumescent section within the elongated silicone rubber member formed substantially adjacent to the back side of the elongated silicone rubber member.