A solid fuel smoker oven having a cooking chamber and a heat source chamber separated by a vertical divider. The heat source chamber includes a gas fired firebox to burn solid fuel. The cooking chamber comprises air channels defined by perforated wall panels comprising calibrated orifices that vary in size from the top of the channel to the bottom to allow air flow and temperatures inside the cooking chamber to be balanced. A fan in the cooking chamber draws heat and smoke emissions from the firebox and directs them into the air channels and recycles the heated air and smoke through the heat source chamber, which limits heat and smoke escape and maximizes temperature stability inside the oven. The fan also functions as a spark arrestor.