I bought a carbon monoxide detector about a month ago or so, and i kinda wonder how or if it works. i held it directly in front of my pellet stove and it never went off. thats a good thing right? well i took it outside and and held it at the exhaust area also and it still never went off. wouldnt it or shouldnt it go off from the exhaust of the stove? i just want to make sure we are all safe and i wonder about the detector, i never had one before. maybe i will go hold it to my truck exhaust, if it doesnt go off from that, then something surely is wrong? any thoughts? thanks.