In the radiant panel test EN ISO 9239-1, a test specimen of size 1050 mm × 230 mm is placed horizontally below a gas-fired radiant panel inclined at 30 °. The specimen is exposed to a defined field of total heat flux, 11 kW/m2 at the hotter end close to the radiant panel, and decreasing to 1 kW/m2 at the other end farther away from the radiant panel. A pilot flame front from a line burner is applied to the hotter end in order to ignite the specimen. The progress of the flame front along the length of the specimen is recorded in terms of the time it takes to travel to various distances. The smoke development during the test is measured on the basis of light obscuration by smoke in the exhaust duct. The duration of the test is 30 minutes. The classification criterion is the critical heat flux (CHF) defined as the radiant flux at which the flame extinguishes or the radiant flux after a test period of 30 minutes, whichever is lower. In other words, CHF is the flux corresponding to the furthest extent of spread of flame. |
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