A control system for a regenerative thermal oxidizer in which contaminated air is first passed through a hot heat-exchange bed and into a communicating high temperature oxidation chamber, and then through a relatively cool second heat exchange bed. A plurality of section panels include specified dimensions, and the section panels each including a slat portion. 5; and q+2y=z, wherein z is the valence of M. When the maximum value of temperature of a plurality of places is not lower than a first lower limit, the cooling section is driven. The circuit preferably is embedded between the first circuit base and a cover to form an electrically-active, or in some embodiments passive, structural member. Gate insulating layers may be interposed between the gate electrode and the pair of fins.