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If your CO alarm chirps every 30 seconds, it's not an emergency but you should replace the CO alarm a.s.a.p. - Fire Line
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Kidde 900-0220CA Front-Load Battery Operated Talking Smoke & Carbon Monoxide AlarmShop Smoke Alarms, Carbon Monoxide Detectors, Combo Alarms, Fire Extinguishers - By Kidde
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