Our hospital has a direct vent fireplace. We have a plug-in CO Alarm (Kidde KN-COPP-3, plug-in with battery backup) in the same room as the fireplace. It's a single-station unit, so it doesn't report anywhere. NFPA 101, 2012 edition, Chap 19.5.2.3(2)(f) requires an "electrically supervised...