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Special thanks is given to those who volunteered their time, gave their special knowledge and struggled with development of a consensus that would reflect the needs of a diversified industry. Suggestions for future improvement are welcome. SMACNA expresses appreciation to the many who have offered suggestions for constructive improvement in the fabrication and installation of duct systems. 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. 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.

Meanwhile, a Committee has already begun work on what will be either addenda or a new edition. A quick overview of the changes is provided in the front of this manual. This Second Edition of the SMACNA commercial metal and flexible duct construction standards is another in a long line dating from the 1950s. SHEET METAL AND AIR CONDITIONING CONTRACTORS’Įxcept as allowed in the Notice to Users and in certain licensing contracts, no part of this book may be reproduced, stored in a retrievable system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher. END OF PREAMBLE (NOT PART OF THE STANDARD) HVAC DUCT CONSTRUCTION STANDARDS METAL AND FLEXIBLE Is the right of all humans to know and speak the laws that govern them. This legal document is hereby made available on a noncommercial basis, as it In order to promote public education and public safety, equal justice for all,Ī better informed citizenry, the rule of law, world trade and world peace, HVAC Duct Construction Standards PREAMBLE (NOT PART OF THE STANDARD)

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