Environmental

Illinois requires carbon monoxide detectors in residential properties. When must a CO detector be installed in a dwelling unit?

AOnly in new construction after 2010
BIn all dwelling units that contain a fossil fuel-burning appliance, fireplace, or attached garage✓ Correct
COnly in single-family homes with basements
DOnly if the building has more than 4 units

Explanation

Illinois law (Carbon Monoxide Alarm Detector Act) requires carbon monoxide detectors in all dwelling units that contain or are connected to a fossil fuel-burning appliance (furnace, water heater, stove), a fireplace, or have an attached garage. This requirement applies to both owner-occupied and rental properties.

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