Steel and aluminum Windows

Does anyone know of a publication that compares the performance of
steel and aluminum windows?  Specifically, other than appearance, is
there information showing that steel windows have better long term
performance than aluminum?

David Wessel
Architectural Resources Group
Pier 9, The Embarcadero
San Francisco, CA  94111
415-421-1680


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                  Conservation DistList Instance 18:21
                 Distributed: Tuesday, November 9, 2004
                       Message Id: cdl-18-21-006
                                  ***