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This paper describes three series of fire tests of an upholstered chair for the investigation of their burning behavior and for the comparison of results between the three series, which were (1) C-series in which the test specimen was located at the center of a room,(2)W-series in which it was located along side a wall ,and(3)K-series in which it was located in the corner of walls. Measurements were made of the following items: mass burning rate, radiative heat transfer to the surroundings, heat transfer to the wall, optical smoke density, etc. In comparing the three series, no obvious difference between mass burning rates could be seen. This tendency were verified by the burning of wood cribs and urethane foams. In this paper only the comparison of mass burning rate is described.