Window wall systems have increased in popularity for high-rise construction. They are more economical than conventional curtain wall, while emulating the aesthetic look of such systems. A window wall system sits atop the floor slab. There is not a traditional joint like that which exists with traditional curtain wall. However, there is a gap between the edge of the floor slab and the slab cover (i.e. the decorative closure that conceals the edge of slab). In fire situations, portions of the window wall system are damaged or consumed. Even a partially consumed slab cover can create a chimney through which fire and hot gases can be channeled to the floor above. Testing has shown that this can be a concern.
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