Abstract: A kiln producing a uniform temperature distribution within the kiln heating chamber and enabling maximum use of heating chamber volume. The heat source is provided by a high-velocity flow of heating gas, which is introduced into the heating chamber through an orifice in a chamber wall. A deflector plate is positioned proximate to, and spaced apart from, the chamber wall so as to overlie the orifice in the path of the high-velocity flow. The dimensions and spacing of the deflector plate may be chosen so as to produce a flow of heat gas primarily parallel to the adjacent wall of the heating chamber and so that the parallel flow will maintain its substantial integrity along the wall much beyond the extremities of the deflector plate. Appropriately positioned gas-entrance ports with associated deflector plates in the kiln are found to produce a uniform temperature distribution without the sacrifice of otherwise usable heating chamber volume.