Which statement about interior finish testing and requirements is NOT TRUE?

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Understanding how interior finish tests reflect fire behavior helps see why the statement about the critical radiant flux test isn’t accurate. The Steiner Tunnel Test is the widely used method for interior finishes and directly measures how a material behaves under flame exposure in a tunnel setup, giving flame spread and smoke development characteristics. The critical radiant flux test, by contrast, assesses the radiant heat level needed to sustain flaming on a material’s surface. It does not provide a flame spread rating, nor does it quantify fuel contributed or smoke developed. Those latter properties are evaluated by the Steiner Tunnel Test (and related tests), while the Life Safety Code indeed specifies interior finish requirements by occupancy. So the claim that the critical radiant flux test measures flame spread, fuel contributed, and smoke developed is the incorrect one.