For safety reasons, all American interior wall and ceiling finishes are grouped into classes according to their flame spread and smoke-developed indexes in accordance with ASTM E 84. Our wallcoverings are all classified as Class A: Flame spread 0-25, smoke-developed 0-450. Class A is “the best”, meaning that it has the least amount of flame spread when tested in accordance with ASTM E84-16. This means that it is suitable for both residential and commercial use from a flame spread and smoke-developing perspective. If you would like a copy of our test results, just ask!