TB61 Identification Of Ductwork

Clear and consistent duct identification is essential for the commissioning, operation, and maintenance of ventilation and air conditioning systems. TB61 provides updated guidance on the identification of ductwork, helping designers, contractors, and clients apply a more standardised approach across ventilation, air conditioning, and simple industrial exhaust systems.

This updated BESA guidance revises previously used categories and identifying colours, with enhanced definition of conditioned and extract air streams. It also removes the use of grey as a colour identifier, replacing it with an alternative symbol that provides better contrast against neighbouring insulation and ductwork materials.

TB61 explains how ductwork identification should be used to show the type of air being conveyed, the direction of airflow, and where necessary the destination of the air or associated plant. It includes guidance on where symbols should be positioned, the recommended identification colours for different air streams, and how further identification should be applied on larger or more complex installations.

Designed for mechanical services contractors, consulting engineers, and building services professionals, this bulletin supports a more consistent and practical approach to ductwork identification. It also includes recommendations on explanatory charts, methods of applying symbols, and post-installation checks to help ensure labels remain clear, accurate, and durable.

Key Features:

• Updated guidance on the identification of ductwork for ventilation, air conditioning, and simple industrial exhaust systems
• Revised colour categories with improved definition of conditioned and extract air streams
• Guidance on symbol placement, airflow direction, and further identification for complex systems
• Recommended colour coding for different air types, including hazardous air and kitchen extract
• Advice on explanatory charts, application methods, and post-installation checks

Published Date: 01/08/2025
Number Of Pages: 6
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