How can a carbon monoxide alarm help?

Carbon Monoxide alarms are available from all good hardware stores. They are usually installed adjacent to sleeping areas or in rooms containing a gas appliance. More than one may be required to offer full protection. This type of alarm is only useful for a certain length of time, advised by the manufacturer. Never hold on to a Carbon Monoxide alarm after its useful date has expired. A Carbon Monoxide alarm should not be used as a substitute for a smoke alarm. 

While Carbon Monoxide alarms may provide an extra measure of warning, they should never be relied on as a substitute for regular inspection and maintenance of your Natural Gas appliances, venting and chimneys.