in the description that follows , like parts are marked throughout the specification and drawings with the same reference numerals , respectively . the drawing figures might not be to scale , and certain components can be shown in generalized or schematic form and identified by commercial designations in the interest of clarity and conciseness . fig1 is a diagram of barbecue oven 100 in accordance with an exemplary embodiment of the present disclosure . barbecue oven 100 can be made of carbon steel , stainless steel or other suitable materials and can be welded , riveted , or formed in other suitable manners . barbecue oven 100 includes firebox 200 that includes charcoal tray 210 having vent 211 disposed therein . firebox upper chamber 220 is located above charcoal tray 210 and is configured to hold wood 221 , charcoal 222 , and ash 223 . firebox upper chamber 220 also includes vent 223 , which is configured to admit combustion air to the upper portion of charcoal tray 210 . firebox lower chamber 230 is located below charcoal tray 210 and is configured to collect ash 231 . cooking chamber 300 is configured to hold meat 301 and includes vent 302 , which can be used to exhaust heated gas from cooking chamber 300 or for other suitable purposes . passageway 400 connects firebox 200 to cooking chamber 300 and includes inlet 401 and outlet 402 . forced draft device 500 is disposed in cooking chamber vent 302 and generates a pressure differential that causes air to flow from the atmosphere surrounding barbecue oven 100 , through vent 223 in firebox upper chamber 220 to the upper portion of charcoal tray 210 , downward through vent 211 in charcoal tray 210 to firebox lower chamber 230 , through passageway 400 to cooking chamber 300 , and through vent 302 back to the atmosphere . this action thoroughly combusts the gases generated by pyrolyzing wood 221 as they pass through hot , oxygenated charcoal 222 and produces a light , sweet flavor profile on meat 301 or other foods that are placed within cooking chamber 300 . forced draft device 500 can further include a thermostat controller having a user - selectable temperature set point , wherein a thermocouple is disposed within cooking chamber 300 . in this exemplary embodiment , when the temperature measured in cooking chamber 300 using the thermocouple is lower than the user - selectable temperature set point , forced draft device 500 can be activated and can draw uncombusted wood smoke from firebox upper chamber 220 through vent 211 of charcoal tray 210 , thus creating clean , fully combusted smoke that is subsequently drawn through passageway 400 and into cooking chamber 300 . this process can continue until the temperature within cooking chamber 300 increases past the set point , at which point the thermostat can turn the forced draft device off . in one exemplary embodiment , barbecue oven 100 can include one or more features from the apparatus disclosed in u . s . pat . no . 7 , 895 , 942 , entitled “ barbecue firebox and method of operation ,” issued mar . 1 , 2011 , which is hereby incorporated by reference for all purposes as if set forth herein in its entirety . fig2 is a diagram of barbecue oven 100 in accordance with an exemplary embodiment of the present disclosure . in this exemplary embodiment , forced draft device 500 is located in passageway 400 and is of suitable design , such as an eductor , so as to tolerate the higher gas temperatures to which forced draft device 500 will be exposed in this location . fig3 is a diagram of barbecue oven 100 in accordance with an exemplary embodiment of the present disclosure . in this exemplary embodiment , forced draft device 500 is attached to the firebox upper chamber vent 223 and is designed to allow high temperature backflow when deactivated , thereby preventing gases generated by pyrolyzing wood 221 from entering firebox lower chamber 230 uncombusted . fig4 is a diagram of barbecue oven 100 in accordance with an exemplary embodiment of the present disclosure . in this exemplary embodiment , passageway 400 additionally comprises second inlet 403 , which is configured to receive gases from firebox upper chamber 220 and wherein activation of forced draft device 500 additionally causes flow from firebox upper chamber 220 , through passageway 400 to cooking chamber 300 , bypassing hot , oxygenated charcoal 222 . in this manner , partially combusted wood gases are provided to cooking chamber 300 , which contributes a heavier , smoky flavor to meat 301 or other food in cooking chamber 300 . while excessive volumes of such partially combusted wood gas can impart a harsh or bitter taste to the food in cooking chamber 300 if the food cooks for a long time ( such as a beef brisket , pork butt or pork shoulder that might be cooked for six hours or more ), if the food is not going to be cooked for a long period of time ( such as a chicken or fish ), the additional partially combusted wood gas can help to impart a wood smoked flavor to the food . fig5 is a diagram of barbecue oven 100 in accordance with an exemplary embodiment of the present disclosure . passageway 400 additionally comprises damper 404 , which enables the operator to select light , sweet gases from firebox lower chamber 230 and / or heavy , smoky gases from firebox upper chamber 220 . in this manner , the proportions of fully combusted wood gas and partially combusted wood gas that are introduced to the firebox can be selected and adjusted by the user . fig6 is a diagram of barbecue oven 100 in accordance with an exemplary embodiment of the present disclosure . dampers 404 are of poppet valve style and enable the operator to select light , sweet gases from firebox lower chamber 230 and / or heavy , smoky gases from firebox upper chamber 220 . fig7 is a diagram of a barbecue oven 100 having a firebox on top , in accordance with an exemplary embodiment of the present disclosure . in this exemplary embodiment , firebox 200 can have a rectangular cross section and is disposed on top of cooking chamber 300 . passageway 400 extends downward from and adjacent to firebox 200 and cooking chamber 300 , and can enter cooking chamber 300 at the bottom , so as to create a more even distribution of heat within cooking chamber 300 . although exemplary embodiments of a system and method of the present invention have been described in detail herein , those skilled in the art will also recognize that various substitutions and modifications can be made to the systems and methods without departing from the scope and spirit of the appended claims .
a barbecue oven that enables operator control of the combustion process through selective control of gas flow through and / or around a hot , oxygenated bed of coals and further enables automatic control of oven temperature through thermostatic regulation of forced draft .