TB59 Further Guidance On Ductwork Connections To Fire Dampers

TB59 provides essential clarification on the correct method for connecting ductwork to fire dampers to ensure life safety and compliance with fire safety regulations. This technical bulletin addresses ongoing industry uncertainty around the use of self-drilling screws and reinforces the importance of break-away joints in ventilation systems.

Purpose:

TB59 builds on the core principles set out in DW145 by offering additional guidance on compliant duct-to-damper connections. It supports duty holders, designers, contractors, and maintenance providers in meeting their obligations under UK fire safety law, particularly where legacy installations may not meet current best practice.

Key Features:

• Reinforces the requirement for break-away joints with low-melting-point fixings as per DW145 and other guidance
• Clarifies the risks associated with using self-drilling screws in fire damper connections
• Details how inappropriate fixings can impair fire damper operation and increase injury risks during maintenance
• Sets out expectations for duty holders under the Regulatory Reform (Fire Safety) Order 2005 and equivalent legislation across the UK
• Supports industry efforts to raise standards in line with building safety reforms post-Grenfell

Important Note:

This publication does not replace DW145 but provides further clarity and interpretation where historic installation practices differ from established guidance.

Who Should Use This Guide:

Ideal for mechanical contractors, building services engineers, designers, compliance managers, fire safety officers, and facilities teams responsible for maintaining ventilation systems in accordance with legal and safety requirements.

Published Date: 15/07/2025
Number Of Pages: 44
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