A conveyor oven for cooking food, the conveyor oven comprising: a housing having an oven chamber in which the food is cooked; a conveyor moveable to convey the food within the oven chamber; a burner assembly operable to emit a flame to heat air for convection cooking of food moving within the oven chamber on the conveyor, the burner assembly including a burner tube extending into a compartment in which the air for convection cooking is heated, the burner tube positioned to receive at least a portion of the flame emitted by the burner assembly, and a passive tube in the compartment positioned opposite the burner tube; a first shelf (224A, 228A) positioned in the housing, and movable relative to the compartment; a second shelf (226A, 228A) positioned in the housing, and movable relative to the compartment; a first fan or a first motor coupled to the first shelf (224A, 228A) and movable with the first shelf (224A, 228A) relative to the compartment; and a second fan or a second motor coupled to the second shelf (226A, 230A) and movable with the second shelf (226A, 228A) relative to the compartment; wherein the first shelf (224A, 228A) and the second shelf (226A, 230A) are each spaced apart from the burner tube along a height of the housing; and wherein the first shelf (224A, 228A) is slidably supported by the housing for movement to position the first fan and the first motor outside the compartment, the second shelf (226A, 230A) is slidably supported by the housing for movement to position the second fan and the second motor outside the compartment, and the first shelf (224A, 228A) is independently moveable relative to the second shelf (226A, 230A). a housing having an oven chamber in which the food is cooked; a conveyor moveable to convey the food within the oven chamber; a burner assembly operable to emit a flame to heat air for convection cooking of food moving within the oven chamber on the conveyor, the burner assembly including a burner tube extending into a compartment in which the air for convection cooking is heated, the burner tube positioned to receive at least a portion of the flame emitted by the burner assembly, and a passive tube in the compartment positioned opposite the burner tube; a first shelf (224A, 228A) positioned in the housing, and movable relative to the compartment; a second shelf (226A, 228A) positioned in the housing, and movable relative to the compartment; a first fan or a first motor coupled to the first shelf (224A, 228A) and movable with the first shelf (224A, 228A) relative to the compartment; and a second fan or a second motor coupled to the second shelf (226A, 230A) and movable with the second shelf (226A, 228A) relative to the compartment; wherein the first shelf (224A, 228A) and the second shelf (226A, 230A) are each spaced apart from the burner tube along a height of the housing; and wherein the first shelf (224A, 228A) is slidably supported by the housing for movement to position the first fan and the first motor outside the compartment, the second shelf (226A, 230A) is slidably supported by the housing for movement to position the second fan and the second motor outside the compartment, and the first shelf (224A, 228A) is independently moveable relative to the second shelf (226A, 230A).