NFPA 270 PDF

Help make lives and property safer and stay compliant by using the latest testing criteria for evaluating the extent of smoke obscuration of specimens.

NFPA 270, Standard Test Method for Measurement of Smoke Obscuration Using a Conical Radiant Source in a Single Closed Chamber, is an essential resource for fire test labs and manufacturers. The updated 2023 edition offers the most current methods of measuring the optical density of smoke resulting from exposing flat materials, products, or assemblies up to 25mm thick to specified levels of thermal irradiance in a single closed chamber.