Carbon Monoxide detectors are designed to endure a particular PPM (parts per million) for a particular amount of time before they will notify you of a problem. I recommend the Nighthawk CO detector made by Kiddie. It has a digital display of PPM to keep you informed. Here is a quote from the product's brochure:ridgeracing wrote:On a second note- My CO detector down stairs (batt powered) is 5yrs old, that one is the one that went off. Up stairs I have one that is 6 months old (plug in and batt powered), it never went off, I took it down stairs while I had odor and other alarm is going off, this newer one dosent go off at all! When I hit test button it goes off.
I am returning it to Lowes! Why else would this not go off?
Per UL 2034 requirements, the CO sensor will not alarm to levels of CO below 30 ppm and will alarm in the following time range when exposed to the corresponding levels of CO.
70 ppm CO concentration 60 – 240 minutes
150 ppm CO concentration 10 – 50 minutes
400 ppm CO concentration 4 – 15 minutes
http://www.homedepot.com/buy/kidde-carbon-monoxid ... 08042.html