Historical
NFPA 253-2000
NFPA 253: Standard Method of Test for Critical Radiant Flux for Floor Covering Systems Using a Radiant Heat Energy Source, 2000 Edition
Describes a procedure for measuring critical radiant flux behavior of horizontally mounted floor covering systems exposed to a flaming ignition source in a graded radiant heat energy environment in a test chamber.
National Fire Protection Association [nfpa]