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NT Fire 032


This method describes a procedure for measuring heat release and smoke production for furniture tested in full scale.


The test object is placed on a weighing cell below a large exhaust hood. The apparatus used in the exhaust system, and the principle for the measurements are described in international standard ISO 9705(E) (the Room/Corner test). A burning wooden crib (ignition source 7 according to British standard BS 5852) is placed on the object, and the development of fire is observed.

Combustion gases are collected during the test by an exhaust hood for further analysis. This gas analysis makes it possible to calculate heat release rate and to assess production of toxic gases from the burning object. Smoke production is assessed by measuring attenuation of a light beam by smoke in the exhaust duct. The attenuation is related to volume flow, resulting in a quantification of smoke density called smoke extinction area [m2/s].


There is no system for classification of furniture based on testing according to NT FIRE 032. However, the method is very well suited as a basis for documentation of fire properties like heat release and smoke production. The results are recorded by a computer, which makes a possibility of using the results in analyses of safety and hazard assessment. The test can be performed according to British Standard BS5852:1990, and the test results can then be used for classification according to this standard.


The test report contains information about:
  • the product
  • name of the product
  • manufacturer and place of production
  • description of the fire development
  • test duration
  • curves of heat release rate, smoke production, production of CO and HCN and weight loss as a function of time.
  • tabulated results
  • photos from the test