DW144 DUCTWORK SPECIFICATION CODE
DW144 DUCTWORK SPECIFICATION SERIES

DW144 DUCTWORK SPECIFICATION CODE

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 CONTRACTORSвЂ™Д®xcept 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

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Where a jobВ specification calls for a leakage limit for the whole system, it will be for the designerВ or client to ensure that the leakage rates of the components are also within theВ required limits. With the retention of three pressure classifications in DW/144 it is hoped thatВ the designer, having control over performance standards, will find leakageВ testing an unnecessary contract expense with regard to low and mediumВ pressure ductwork see note Financial Caution.Дuctwork contractors faced with a job calling for leakage testing should take thisВ requirement very seriously and satisfy themselves as the job progresses that theВ required leakage rate or rates are within the limits set by the designer or the client.The cost of making good an installation that has been found on completion to haveВ failed in this respect can be very expensive.ДW/144 specifies leakage limits for the ductwork alone, because the ductworkВ contractor has no control over the leakage characteristics of the various componentsВ which go to make up the whole of the air distribution system.

DW144 DUCTWORK SPECIFICATION SERIES

Ductwork Specification DW/142, published by the HVCA in 1982, providedВ for the first time in a long series of such publications for leakage limits overВ the whole range of air pressures covered by the specification and (whereВ required) a test procedure to establish conformity.ДЄlthough leakage testing of high-pressure ductwork is still mandatory in DW/144В (as was the case in previous ductwork specifications issued by HVCA) the leakageВ testing of ductwork designed to operate at low and medium pressures is required onlyВ where so specified in individual job specifications.

Dw144 ductwork specification