库方方方方万HVACDUCT CONSTRUCTIONSTANDARDSMETAL AND FLEXIBLESECONDEDITION -1995方方方SHEET METAL AND AIR CONDITIONING CONTRACTORS'NATIONAL ASSOCIATION,INC.4201 Lafayette Center DriveChantilly,VA 22021万HVACDUCT CONSTRUCTIONSTANDARDSMETAL AND FLEXIBLE方SMACNA 1995方SHEET METAL AND AIR CONDITIONING CONTRACTORS方NATIONAL ASSOCIATION,INC.Chantilly,VA 22021Printed in the U.S.A.、钉FIRST EDITION-1985SECOND EDITION-1995方he Nstored in a retrievable sys钉FOREWORDoverview of the changes is provided in the front of this manual.rodded metal,new fat oval duct standads,for joints and reinforcemeby majornts.And,indirectly related to these standarerformance specificationsrds,significant progress is being maademechanical code wriling agencies in developing one uniform,consensus-supported code for theentire nation.方in the fabrication and installation of duct systems.Suggestionsthanks is given to those who volunteefor future improvement are welcome.Speciadevelopment of a consetime.gave their special knowledge and struggled withsus that would reflect the needs of a diversified industry.Although standardizationwould serve a designer's need equally orbetter exists.nation against the use of any product or method thatSheet Metal and Air Conditioning文钉文文万万方文HVAC DUCT CONSTRUCTION STANDARDS METAL AND FLEXIBLE库