A seal assembly for an air handling system of a motor vehicle comprises a panel having a surface disposed on a first plane, a plurality of spaced apart ribs with an end of each of the ribs disposed on a second plane, and a sealing structure having a first face in facing relationship with the surface of the panel and an opposing second face in facing relationship with the plurality of the spaced apart ribs. The first face includes a first projection projecting therefrom including a first sealing surface spaced apart from the second face of the main body by a first distance and second projection projecting away from the first sealing surface of the first projection and including a second sealing surface spaced apart from the second face of the main body by a second distance greater than the first distance.