My CO alarm is located in the family room on the 1 floor about 5 feet from my fireplace insert. Now, I don't have A/C so the sliding door and 5 windows are usually open in the summer. I went by it today and just checked what the highest reading recorded was since I stop using the stove. I got a reading of 17! When the stove was in use, the highest transient readings were one at 11 and one at 13. Maybe the government should worry less about CO2 caused global warming and figure out the CO climate change connection!