The factorial design with three replications was used in this study. Radiation intensity varied from 700 °C (2.97 μm), 800 °C (2.70 μm) and 900 °C (2.47 μm). The distances between emitter and absorbing surface were set at 0.20, 0.30, 0.40 and 0.50 m. Temperature values of emitter and air in chamber were recorded by using data logger (YOKOGAWA model DX200) at each 20 second with type K thermocouples.