Not sure if a CO detector will pick up CO2. (Never tried it.) People produce an awful lot of CO2 and I know we have crowded classrooms that all have CO detectors but none ever went off. CO2 kills by displacement, which is one of the dangers of dry ice fog. We had an actor who came up through the fog once who almost didn't make it up.A $30 detector could have prevented a death. This is a lesson for all of us who heat with natural gas or oil, too. Install the detector.
CO2 from a car is dangerous. Frozen CO2 (Cardice in the UK) can be even more dangerous. Hanging one's head over a open cardice cabinet can cause a puff of freezing CO2 to enter ones lungs and the shock is so great you fall into the cabinet - dead! And, as a young lab tech in Libya I saw several 'deaths in the bath' whereby birds had built nests in the gas heater exhaust pipe causing 'double' burning and CO build up. It pays to take care and know what your dealing with. Read the MSDS sheets! (Material Safety Data Sheet)
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