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Referenced by NFPA 101®: Life Safety Code® and building codes as the test procedure used to determine the critical radiant flux of a material, NFPA 253 is a test method that is designed to provide a basis for estimating one aspect of the fire exposure behavior of a floor covering system installed in a building corridor.

• Safety Precautions
• Radiant Heat Energy Flux Profile Standardization
• Test Procedure
• Calculations

Additional detail was provided on simulating a concrete floor during the test. Provisions regarding safety precautions were moved to the Annex material, which also includes a procedure for calibration of apparatus, mounting methods, a sample data log, and commentary on critical radiant flux test. (Approx. 16 pp., 2006)