Fire-Resistive Duct Assemblies - A Comparison of International Test Methods and Applications for U.S. Code Requirements

Ductwork used in HVAC systems often penetrates fire-resistance-rated assemblies, creating pathways for fire and smoke to spread between otherwise protected areas if not properly protected. U.S. building codes address this risk by requiring fire dampers, shaft enclosures, or fire-resistance-rated duct assemblies tested for the intended application. While international test standards like ISO 6944 or BS 476 Part 24 are sometimes proposed as alternatives, their use requires careful evaluation to determine equivalence with U.S. standards.

This white paper explores how U.S. code officials and design professionals can assess whether international duct fire-resistance tests meet the requirements for an Alternative Means and Methods approach under Section 104.11 of the International Building Code (IBC).

After reading this paper, you will:

• Understand the key differences between U.S. and international duct fire-resistance test methods
• Learn how ASTM standards – particularly ASTM E814 and ASTM E2816 – are used to demonstrate compliance with IBC requirements
• Identify the documentation needed to support an Alternate Means and Methods request involving internationally tested duct assemblies
• Recognize the limitations and challenges of using ISO or BS-tested ducts in projects governed by U.S. codes

Read the whitepaper here.

For more detailed information on Alternate Means and Methods, refer to this whitepaper.