An improved method and apparatus for imparting a smooth surface to a gypsum fiber panels. The exhaust gas cleaning apparatus includes a particulate collecting section and a filter regenerating section placed next to each other in the flow direction of an exhaust gas, and a movable frame. The method also includes generating additional electric power using a thermoelectric generator by routing exhaust from the fuel cell to a hot side of the TE and routing fuel cell intake gases to a cold side of the TE. The inner tubes are non-rotatably connected to the shafts and rotatably connected to the outer tubes. The data access interface may be configured to provide external access to the response data and configure thresholds. The method may be used to fabricate a flash plus logic structure.