A study on distribution of infrared (IR) ray in the drying chamber, at different radiation intensities generated by an IR emitter, was conducted by measuring air temperature inside the chamber, on absorbing surfaces installed as horizontal planes. The testing aimed to describe the radiant distribution on the test planes, being placed with different spacings. The air temperature distribution was analyzed, based on response surface methodology (RSM) obtained from a second order polynomial model (R2=0.908). The surface and contour plots of air temperature levels (response) on the absorbing surfaces in the drying chamber were made. The results would be useful for the selection of an appropriate size of area for drying with uniform distribution of IR according to the user’s requirement.