Abstract: The present invention is a combustion chamber for an incinerator that has a chamber with a plurality of refractory walls and an opening for the delivery of materials into the chamber. A hearth is contained within the chamber. The hearth has a surface for the receipt of these materials and is positioned generally adjacent to the opening. An oscillator is connected to the hearth for causing the hearth to oscillate within the chamber. An air plenum is arranged beneath the hearth. The hearth has a first and second flange extending upwardly along each side of the hearth. A third flange extends upwardly at the end of the hearth adjacent to the chamber opening. The hearth has a plurality of air passageways extending therethrough and communicating with the air plenum. A collection ridge is formed about one edge of the hearth. A suitable heat exchange fluid circulating system is provided within the hearth so as to pass a fluid and heat exchange relationship with the hearth.