The law stipulates that one carbon monoxide alarm will be sufficient when installed on a story of a dwelling unit or sleeping unit having both a sleeping area and a carbon monoxide source.
The law also requires that carbon monoxide alarms be interconnected within each unit, so that when one alarm is triggered, all of the alarms in the unit sound. However, battery-operated alarms, where their use is permitted, are exempted from the networking requirement.
For information visit http://dos.state.ny.us/code/COAlarm.htm.