National Fire Protection Association Carbon Monoxide Safety Tips:
Install carbon monoxide alarms in a central location outside each sleeping area
Call your local fire department to find out what number to call if the alarm sounds
Test your carbon monoxide alarm at least once a month
Have fuel-burning heating equipment professionally inspected each year
Remember that carbon monoxide alarms are not substitutes for smoke alarms.
Be able to recognize the difference in sound between a carbon monoxide and smoke alarm
Never use an oven to heat your home
If using a fireplace, make sure the flue is open for adequate ventilation
Source: National Fire Protection Association