Is a hose stream test required for ASTM E1966-UL 0079?

The hose stream test is a critical component in evaluating the performance of firestop systems, specifically under certain conditions outlined by the ASTM E1966-UL 0079 standard. This standard primarily focuses on the ability of firestop systems to maintain their integrity during a fire.

In the context of the question, the correct choice indicates that the hose stream test is indeed required, but only for specific joint types. This is significant because it acknowledges that not all firestop products or joint configurations necessitate the hose stream test to demonstrate their performance and effectiveness in fire-resistance scenarios.

The hose stream test simulates the impact of fire control efforts, where firefighters might use high-pressure water hoses to extinguish a fire. The resilience of a firestop system under such conditions is essential for ensuring that it can withstand not just heat but also physical stress without compromising the integrity of fire barriers. This selective requirement means that designers and installers must have a clear understanding of which firestop applications will face hose stream conditions to ensure proper assessments are conducted.

In practice, the specific joint types that require the hose stream test are typically those that are more likely to be exposed to such conditions, ensuring that firestop systems maintain their intended performance in real-world applications.