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are smoke detectors also co2 detectors, smoke & co2 detectors, are combination smoke and co2 detectors good, are smoke detectors carbon monoxide detectors, smoke fire and co2 detectors, do smoke detectors detect carbon dioxide, combination smoke and co2 detectors, smoke and co2 detector reviews, smoke alarm and co2 detector, smoke and carbon dioxide detectors, carbon dioxide detector vs smoke detector, smoke detector with carbon dioxide, carbon dioxide and smoke detector, co2/smoke detectors for homes, smoke detector and carbon dioxide detector