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This is a series of six guides intended to provide a working knowledge of residential heating and cooling duct systems, an understanding of the major issues concerning efficiency, comfort, health, and safety, and practical tips on installation and repair of duct systems. These guides are intended for use by contractors, system designers, advanced technicians, and other IIVAC professionals.

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This paper proposes a procedure for extracting package models from multi-port S-parameters. By utilizing all the elements in an nxn S-parameter matrix, the proposed deterministic procedure provides a better starting point for Sparameter optimization when compared with underdetermined extraction procedures based on multiple 2-port S-matrices using EIMJEDEC Standard 123. An efficient procedure is discussed for generating a ladder model consisting of an arbitrary number of identical sections.