What type of testing is conducted for Curtain Wall (CW) systems?

The correct approach to testing Curtain Wall (CW) systems is through the Intermediate Scale Multi-story Apparatus (ISMA) as outlined in ASTM E2307. This testing method is specifically designed to evaluate the performance of curtain wall systems in the context of fire resistance and smoke spread. The significance of using ISMA lies in its ability to create conditions that simulate real-life scenarios in multi-story buildings, thereby assessing how effectively the curtain wall can contain fire and prevent smoke from migrating between floors.

This method focuses on large-scale tests that reflect the complex interactions occurring within a built environment during a fire event. It takes into account not just the materials used but also the system's construction and the manner in which it fits into the overall architectural design.

In contrast, while there may be other relevant standards for various wall types and structural tests, they do not specifically address the unique requirements and performance characteristics necessary for curtain walls in fire conditions. The other testing options do not align with the specialized focus needed for Curtain Wall systems.