An oven system may include a cooking chamber, a combustion chamber, and a flue. The flue may be arranged to route a first portion of the combustion gas produced in the combustion chamber into the cooking chamber and route a second portion of the combustion gas along a route that bypasses the cooking chamber. The flue may also be arranged to collect the first portion of the combustion gas from the cooking chamber and to exhaust both the first portion and the second portion of the combustion gas from the oven system.