Match each rating class for interior wall and ceiling finishes with its description.

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Multiple Choice

Match each rating class for interior wall and ceiling finishes with its description.

Fire performance of interior finishes is described by how fast flames spread along a surface (Flame Spread Index) and how much smoke is produced (Smoke Development Index). The lower the flame spread, the better the rating. For the best class, the Flame Spread Index is 0-25, with the Smoke Development Index allowed up to 450. That combination directly matches the description given for the top-rated class, so this is the correct pairing. The other options assign higher flame-spread ranges to the top class (for example, 76-200 or 26-75), which would place those materials in lower classes rather than the best one. In short, the most fire-resistive interior finish has the smallest FSI range, 0-25, with SDI up to 450.

Fire performance of interior finishes is described by how fast flames spread along a surface (Flame Spread Index) and how much smoke is produced (Smoke Development Index). The lower the flame spread, the better the rating. For the best class, the Flame Spread Index is 0-25, with the Smoke Development Index allowed up to 450. That combination directly matches the description given for the top-rated class, so this is the correct pairing. The other options assign higher flame-spread ranges to the top class (for example, 76-200 or 26-75), which would place those materials in lower classes rather than the best one. In short, the most fire-resistive interior finish has the smallest FSI range, 0-25, with SDI up to 450.

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