A printed circuit board and method thereof and a solder ball land and method thereof. A fill material, such as a dielectric material, is located between the plurality of second portions. Between the first heating section and the second heating section, a partitioning fin is disposed for blocking communication of air mutually between the first and second heating sections. The metal reinforcement member defines one or more openings and the polymeric flange is joined with the metal reinforcement member, such that at least a portion of the polymeric flange extends through the openings and forms one or more annular surfaces for contacting the engine cylinders. The fin assembly is disposed at the air outlet of the centrifugal blower and includes a plurality of fins and has a plurality of air passages formed between adjacent fins.