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Kidde Combo photoelectric smoke/C0 alarm going off every hour… will beep twice. Say fire twice. Beep again. Then stop. : r/firealarms
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BRK Electronics SC9120B Hard Wired T3 Smoke/T4 Carbon Monoxide Ionization Alarm with Strobe - Vaughn Engineering
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FIRST ALERT BRK SC9120FF Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, 1 pack , White - Amazon.com
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BRK Electronics SC7010B Hard Wired T3 Smoke/T4 Carbon Monoxide Photoelectric Alarm with Strobe - Vaughn Engineering
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