I recently installed a carbon monoxide monitor in my relatively sealed boiler room. I installed it approx 18" off floor and 2' away from my "wood gun" boiler. The alarm has gone off twice in the last month, 56 ppm and 71 ppm. 25 is the safe limit for workplaces around here. I have a large garage door next to boiler so each time it was very easy to flush the room out by opening it. Would this be due to smoke leaking out the odd time. Do many of you have an alarm?