The revised "Round Industrial Duct Construction Standard," 3rd edition, 2013, an American National Standard, ANSI/SMACNA 005-2013, is now available. The standard expands the scope of the second edition, updating the duct materials to include aluminized steel, temperature correction factors for round industrial, and minimum decimal thickness for aluminum duct selection tables. Several chapters offer a standardized, engineering basis for design and construction of industrial duct of Class 1 to Class 5 air. A spiral duct chapter for Class 1 and Class 2 air covers design pressures ranging from 30 in. wg negative to 50 in. wg positive, plus carbon and galvanized steel tables. The 660 page-book includes expanded tables for stainless steel and aluminum, expanded tables for duct sizes up to 96 inches in diameter, plus Class 5 systems handling corrosives and spiral lock-seam pipe. Appendix chapters provide overviews of methods for including crawlspaces in the conditioned space and such HVAC accessories as UV lights, zoning, and advanced air filtering methods to enhance indoor environmental quality (IEQ) for occupants. More detailed information and new concepts are included in the 278-page publication for earth energy heat exchanger methods and ground source heat pumps. Updated construction code requirements are reflected throughout the range of HVAC system types along with energy efficiency and sustainable practices. Installation, operation, maintenance, and guidance for residential heating, ventilation, and air conditioning systems are also included.
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SMACNA's mission is to provide products, services, and representation to enhance members' businesses, markets, and profitability. Located in headquarters outside Washington, D.C., the Sheet Metal and Air Conditioning Contractors' National Association (SMACNA), an international association of union contractors, has 1,834 members in 103 chapters throughout the United States, Canada, Australia and Brazil. SMACNA members perform work in industrial, commercial, institutional and residential markets. They specialize in heating, ventilating and air conditioning; architectural sheet metal; industrial sheet metal; kitchen equipment; specialty stainless steel work; manufacturing; siding and decking; testing and balancing; service; and energy management and maintenance. The voluntary technical standards and manuals developed by SMACNA Contractors have found worldwide acceptance by the construction community, as well as foreign government agencies. ANSI, the American National Standards Institute, has accredited SMACNA as a standards-setting organization. SMACNA does not seek to enforce its standards or provide accreditation for compliance. SMACNA standards and manuals address all facets of the sheet metal industry, from duct construction and installation to air pollution control, from energy recovery to roofing. SMACNA's Technical Resources Department fields several thousand technical questions annually from architects, engineers, manufacturers and government personnel. More than 17,000 orders for SMACNA technical manuals are processed and shipped each year from SMACNA national headquarters. The association offers contractors professional assistance in labor relations, legislative assistance, research and technical standards development, safety, marketing, business management and industry issues.