Abstract: A toxic gas detector including ductwork, an enclosure, and a toxic gas sensor. The ductwork communicates with a heating source of a forced hot air heating system. The enclosure is attached directly to, and communicates with, the ductwork, and is disposed directly adjacent to the heating source. The toxic gas sensor is disposed in the enclosure, communicates with the ductwork, and is disposed directly adjacent to the heating source so as to allow the toxic gas sensor to detect a toxic gas at the heating source before the toxic gas has a chance to be distributed through the ductwork and infiltrate all outlets of the ductwork, and when the toxic gas sensor detects the toxic gas at the heating source, the toxic gas detector automatically shuts down the heating source.

Abstract: This present invention is that of an accurate and immediate methodology of carbon monoxide detection is accomplished by utilizing an inserted modified venturi that samples air flow exiting in the immediate vicinity of a heater source's duct system. This is completely functional in any type of heating system incorporating a duct system for forced hot air transfer throughout a circuitous closed environment. Further, upon detection of any carbon monoxide in said heating system, at the immediate source of heated air exiting, an annunciation alarm and heating system “shut down” or “fail-safe” mode will be instituted in effect. All monitoring will be under constant control by algorithms within a microcontroller circuit.