Available for S and SA-Series direct gas-fired space heaters, CE-Smart™ System includes controls for ventilation, indoor air quality, and temperature. Unit is housed in lockable NEMA 1 enclosure equipped with 3-position selector switch; combination 7 day programmable timer and thermostat or temperature setback system; override timer; and intermittent/continuous control. Indicating lights are provided for blower operation (green), burner operation (red), and reset (amber).