Carbon Monoxide Alarms must bear the label of a nationally recognized testing laboratory, such as Underwriters Laboratories (UL), indicating that it is appropriate for its intended use. For existing buildings, CO alarms can be battery-powered or the electrical type that plug into an electrical outlet. New buildings must have CO alarms that are hard-wired to an un-switched circuit of the building's electrical system and must be provided with battery back-up in case of power interruption.
There are different models of CO alarms. The base model has detection and alarm devices. Other models also have a digital message display that indicates the parts per million of CO when the alarm activates. Any of the models are appropriate for installation.
The installation of a combination smoke and CO alarm is permitted.
