This is National Fire Prevention Week
(AP Photo/Ethan Swope, File)

This is National Fire Prevention Week. Illinois Fire Marshal spokesperson JC Fultz says a single chirp every 30 to 60 seconds on a smoke detector is a sure sign of low battery that needs changing. He added that a continuous set of three loud beeps means there is smoke or fire and you should get out immediately and call 911. Smoke alarms should be replaced every ten years.