I've never seen a ceiling mounted CO detector. CO is basically neutral buoyant when mixed with air. The CO detectors are usually mounted near the floor. Ceiling mounted detectors are usually ion detectors (as a fire produces ionized gasses). Most likely your furnace burned off some accumulated dust (ionized gas) and triggered the ceiling mounted smoke detectors. You might try and confirm whether you ceiling detectors are smoke or CO. If it's both, it will be labeled as CO and smoke detector.
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Dustin and Doris
2018 Crossroads, Sunset Trail 33CK,
38', 7600 lbs empty, 8300 lbs loaded.
2016 Tundra: 5.7L with towing package with added "Roadmaster Active Suspension"
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