Last summer I installed new smoke detectors. They are connected to my security system. So when one goes off the horn in the hall goes off and the noise is so loud it hurts. So, one day last week, my adult son was home alone and loaded a log into the stove. Long story but a coal jumped out and he didn't see it. He was up in his room when the horn went off. The rug infront of the stove had cought and was smoking. He had plenty of time to put it out. The six month old rug has a good size burn but thats all that happened. I hate to think how bad it could have been. I'm not sure if he would have heard a regular smoke detector. Son wont touch the stove any more and thats fine with me. I love my smoke detectors. The neat thing with this setup is the security system called my cell phone when the alarm went off. Thats cool.