توضیحات :
NFPA 268 – Standard Test Method for Determining Ignitability of Exterior Wall Assemblies Using a Radiant Heat Energy Source
۲۰۲۲ Edition
Chapter 1 Administration
۱-۱ Scope.
۱-۱-۱ This fire test response standard describes a method for determining the propensity of ignition of exterior wall assemblies from exposure to 12.5 kW I m2 (1.1 0 Btu/ ft2-sec) radiant heat in the presence of a pilot ignition source.
۱-۱-۲ This test method evaluates the propensity of ignition of an exterior wall assembly where subjected to a minimum radiant heat flux of 12.5 kW/ m2 (1.10 Btu/ ft2-sec) . This method determines whether ignition of an exterior wall assembly occurs when the wall is exposed to a specified radiant heat flux, in the presence of a pilot ignition source, during a 20-minute period.
۱-۱-۳ This test method utilizes a gas-fired radiant panel to apply a radiant heat flux of 12.5 kW/ m2 (1.10 Bnt/ ft2-sec) to a representative sample of an exterior wall assembly while the test specimen is exposed simultaneously to a pilot ignition source.
۱-۱-۴ This test method applies to exterior wall a5semblies having planar, or nearly planar, external surfaces.
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