ADDENDUM - April 2024
DW144 - Specification for sheet metal ductwork
The following revisions have been incorporated into DW144 – Specification for sheet metal ductwork, Third Edition 2016, to reflect the content of the revised
BESA publication TR19®Air - Specification for internal cleanliness and hygiene management of ventilation systems, published in April 2024.
Section/Clause
Page
Subject
Current
Change
Reason for change
All sections
Document title
TR/19
TR19® Air.
To reflect the new BESA specification
TR19®Air.
Section 20
Clause 20.3
Access panels
Table 20 - Location of access panels
for Inspection and/or internal
cleanliness.
Previously, stated as a shared
responsibility with the specialist
cleaner, DW144, Table 20 now states
that ‘for new installations, the
ductwork contractor is responsible
for the provision of all suitable access
panels.’
The BESA Technical Committee have
made the change to DW144 to reflect
the specific responsibilities of the
designer under the Construction
Design Management (CDM)
regulations 2015.
Section 20
Table 20
Access panels
Notes to table 20
New notes added (1 - 10)
To reflect the content of the new BESA
specification TR19®Air
Section 20
Recommended
size of openings
Addition of a table from TR19® Air
- Recommended size of openings
(rectangular & flat oval)
To reflect the content of the new BESA
specification TR19®Air
The changes set out in this addendum have been incorporated into DW144 – Specification for Sheet Metal Ductwork, Third Edition 2016, (V2) - which
can be purchased from BESA Knowledge. Existing Customers can download an updated copy from their Knowledge Portal Account free of charge.
This document is based on knowledge available at the time of publication. It is meant for generalpurposes, not for reliance on in relation to specific technical or legal issues, in which
case you should always seek independent advice. No responsibility of any kind for any injury, death, loss, damage or delay however caused, resulting from the use of the advice and
recomendations contained herein, is accepted by the authors or others involved in its publication including the Building Engineering Services Association (BESA).
©2024 BESA
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Addendum April 2024
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