DW/144 Specification For Sheet Metal Ductwork

DW/144 is the recognised industry standard for the design, manufacture, and installation of sheet metal ductwork used in building services engineering. It defines the technical requirements for low, medium, and high pressure/velocity air systems and provides a consistent basis for specifying, fabricating, installing, and testing ductwork.

Aligned with the latest BS, BS EN ISO, and other relevant standards and regulations, DW/144 supports project teams in achieving high standards of quality, efficiency, and compliance.

The specification is intended for use by system designers, contractors, manufacturers, and clients who require clear, standardised technical guidance for delivering ventilation systems. It sets out both mandatory and recommended practices, reflecting industry developments in materials, construction methods, and performance expectations.

Key Topics Covered Include:

• Ductwork application and system classification
• Approved materials and finishes
• Air leakage limits and performance classes
• Construction standards for rectangular, circular, and flat oval ductwork
• Hangers, supports, and bracketry
• Integration of smoke and fire dampers
• External ductwork weather protection
• Internal duct linings and thermal insulation
• Specification for air terminal units and accessories

Clear reference tables throughout the document provide ready access to sizes, thicknesses, leakage limits, and test requirements, supporting both design and procurement.

April 2024 Addendum:

This edition incorporates updates aligned with the revised TR19® Air: Specification for Internal Cleanliness and Hygiene Management of Ventilation Systems, published in 2024.

Published Date: 01/01/2016
Number of Pages: 180
ISBN: 978-0-903783-64-4

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