An apparatus for producing a H 2 -containing product, the apparatus comprising: a gas turbine having an outlet for withdrawing an exhaust stream from the gas turbine; a forced draft fan having an outlet for discharging an oxidant stream; a valve assembly for providing a draft air stream; a reformer furnace operatively connected to the gas turbine, the forced draft fan, and the valve assembly, and operatively disposed to receive at least a portion of the exhaust stream from the gas turbine, at least a portion of the oxidant stream from the forced draft fan, and the draft air stream from the valve assembly; a heat exchanger operatively disposed between the forced draft fan and the reformer furnace, wherein the heat exchanger is operatively disposed to receive and heat the at least a portion of the oxidant stream from the forced draft fan, and the reformer furnace is operatively disposed to receive the at least a portion of the oxidant stream from the heat exchanger; a conduit operatively disposed to transport the at least a portion of the exhaust stream from the gas turbine, the at least a portion of the oxidant stream from the forced draft fan and heat exchanger, and the draft air stream from the valve assembly to the reformer furnace; a sensor responsive to a pressure in the conduit; and a controller operatively connected to the valve assembly for providing the draft air stream, the controller operatively connected to the sensor and responsive to signals from the sensor, wherein the controller is adapted to instruct the valve assembly to open when the sensor detects a pressure less than a predetermined lower limit target pressure so as to allow draft air to pass to the reformer furnace, whereby on detection of interruption of the exhaust gas stream from the gas turbine the valve assembly is opened to a predetermined position based on the gas turbine operating rate prior to the start of the interruption of the exhaust gas stream from the gas turbine. a gas turbine having an outlet for withdrawing an exhaust stream from the gas turbine; a forced draft fan having an outlet for discharging an oxidant stream; a valve assembly for providing a draft air stream; a reformer furnace operatively connected to the gas turbine, the forced draft fan, and the valve assembly, and operatively disposed to receive at least a portion of the exhaust stream from the gas turbine, at least a portion of the oxidant stream from the forced draft fan, and the draft air stream from the valve assembly; a heat exchanger operatively disposed between the forced draft fan and the reformer furnace, wherein the heat exchanger is operatively disposed to receive and heat the at least a portion of the oxidant stream from the forced draft fan, and the reformer furnace is operatively disposed to receive the at least a portion of the oxidant stream from the heat exchanger; a conduit operatively disposed to transport the at least a portion of the exhaust stream from the gas turbine, the at least a portion of the oxidant stream from the forced draft fan and heat exchanger, and the draft air stream from the valve assembly to the reformer furnace; a sensor responsive to a pressure in the conduit; and a controller operatively connected to the valve assembly for providing the draft air stream, the controller operatively connected to the sensor and responsive to signals from the sensor, wherein the controller is adapted to instruct the valve assembly to open when the sensor detects a pressure less than a predetermined lower limit target pressure so as to allow draft air to pass to the reformer furnace, whereby on detection of interruption of the exhaust gas stream from the gas turbine the valve assembly is opened to a predetermined position based on the gas turbine operating rate prior to the start of the interruption of the exhaust gas stream from the gas turbine.