One or more techniques andor systems are disclosed for a portable gas-fired heater comprising a housing, a burner assembly, and a carbon dioxide detector system. Main read wordlines and main program wordlines are connected to the local wordlines in each sector. power into a high frequency power and a ground fault detection circuit are mounted and within a casing 52. Client processing provides a variety of useful searches, many options for processing imagery objects, and enables clients to contribute to objects collected for enhancing a collaborative social experience for the benefit of all users. This inventive method can also be used for metal frames, especially for non-magnetizable ones. According to the determined shape, the circuit or processing unit controls a lamp driver circuit for each light source in order to control the intensity of the light output by each light source.