Five Essential Facts You Need to Know About Carbon Monoxide Detectors
Response to CO Detector Alarm

In customarily safe conditions, your detector should remain silent. So, if an alarm sounds, take it seriously. Immediately evacuate everyone from the building, and call your local fire department or a professional to inspect for CO. Counterintuitively, do NOT ventilate the building by opening windows and doors, unless directed by a professional. That can complicate the task of identifying a leak's source, as fresh air can clear CO quickly.