OSU Rate of Heat Release Apparatus

OSU Rate of Heat Release Apparatus

The OSU Rate of Heat Release Apparatus is used to expose aircraft interior cabin materials to an incident radiant heat flux of 35 kW/m2, to comply with FAR 25.853 requirements. The apparatus, built in accordance with FAA Fire Test Handbook, Chapter 5, is provided in three parts: test chamber, control unit and data acquisition and analysis system.


  • Stainless Steel Insulated Test Chamber, with Gasketed Door and Viewing Window
  • Matched Set Glow Bar Elements as Heat Source (with Corrosion-resistant Stainless Steel Housing)
  • Dual Glow-bar Power Controllers, for Ease of Heat Flux Uniformity Adjustment
  • Upper Pilot, Lower Pilot (with Spark Ignition) and Methane Calibration Gas Burners
  • Thermopile for Heat Measurement, with 5 Hot Thermocouple Junctions in the Chimney and 5 Cold Thermocouple Junctions in the Air Chamber
  • Air Distribution System and Exhaust Stack
  • Specimen Holder, with Pressure Plate, Mounting Bracket and Drip Pan
  • Stand-alone Control Unit Housed in 19″ Rack, with:
    • Thyrister Control for Radiant Heat Source
    • Flow Control for Burners
    • Controls for Air Supply System
  • Calibration Heat Flux Meter
  • Software, Interface, Computer and Laser Printer


  • The unit can also be modified to comply with ASTM E 906 and to conduct tests at different incident heat fluxes, for research purposes. The unit can also be supplied with several options: smoke measurement system (white light or laser), oxygen depletion calorimetry (shown in rack above) and facilities for monitoring sample mass loss continuously.
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