This Second Edition of the SMACNA commercial metal and flexible duct construction standards is another in a long line dating from the 1 950s. A quick overview of the changes is provided in the front of this manual. Meanwhile,a Committee has already begun work on what will be either addenda or a new edition. Subjects being investigated are ribbed round duct, fatique testing of tie rodded metal, new flat oval duct standards, duct liner pin lengths, more double wall casings, sealant specifications and more performance specifications for joints and reinforcements. And, indirectly related to these standards, significant progress is being made by major mechanical code writing agencies in developing one uniform, consensus supported code for the entire nation.
SMACNA expresses appreciation to the many who have offered suggestions for constructive improvement in the
fabrication and installation of duct systems. Suggestions for future improvement are welcome. Special thanks is given to those who volunteered their time, gave their special knowledge and struggled with development of a consen-
sus that would reflect the needs of a diversified industry. Although standardization intrinsically involves selection,no intention of discrimination against the use of any product or method that would serve a designer’s need equally
or better exists.
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