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The new 2019 edition of NFPA 253, Standard Method of Test for Critical Radiant Flux of Floor Covering Systems Using a Radiant Heat Energy Source offers the most accurate means of estimating one aspect of the exposure behavior of horizontally mounted floor covering systems for an advanced understanding of how materials will react to fire including instruction on interpreting results and appropriate safety precautions. (Softbound, 21 pp., 2019)