CARBON MONOXIDE ALARMS
Carbon Monoxide, CO for short, alarms should be installed in a central location outside each sleeping area and on every level of the home and in other locations where required by applicable laws, codes or standards. For the best protection, interconnect all CO alarms throughout the home. When one sounds, they all sound.
Choose a CO alarm that is listed by a qualified testing laboratory. Check the instruction manual for the manufacturer's suggested placement height.
Test CO alarms at least once a month; replace them according to the manufacturer’s instructions.
If the CO alarm sounds, immediately move to a fresh air location outdoors or by an open window or door. Make sure everyone inside the home is accounted for. Call for help from a fresh air location and stay there until emergency personnel declare that it is safe to re-enter the home.
Source: NFPA, Public Education, Carbon Monoxide Alarms