What thickness must a steel sleeve lining be for a duct to penetrate a fire partition without needing a fire damper?

The thickness of a steel sleeve lining that allows a duct to penetrate a fire partition without requiring a fire damper is essential for ensuring fire safety and compliance with building codes. A thickness of 0.060 inches is specified because it provides adequate protection against the spread of fire while maintaining structural integrity.

In certain fire-rated assemblies, the steel sleeve must meet specific requirements to prevent flames and heat from passing through the duct and compromising the safety of adjacent areas. The designated thickness of 0.060 inches is considered sufficient to achieve this fire-resistive barrier under typical conditions, effectively mitigating the risk of fire spread through the penetration point.

Thinner materials may not offer the necessary durability or fire resistance, while excessively thick materials would not be practical for installation in a typical duct system. Therefore, when designing or installing ducts that pass through fire partitions, adhering to this specified thickness ensures both compliance with fire safety standards and the overall effectiveness of the fire protection strategy.