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There are ionization and photoelectric smoke alarms. Ionization alarms are better at detecting fast flaming fires while photoelectric alarms are better at detecting slower smoldering fires. Which smoke detectors did you install or did you install a dual alarm?

Recently, both of my CO detectors reached the end of their life so I have to replace them. Right now, all of my smoke alarms are the ionization type. I was considering replacing a few of the hardwired alarms with photoelectric/CO alarms. In the upstairs hallway, there are two hardwired alarms - one at each end. I thought possibly that I may leave one ionization alarm in place and replace the other with a photoelectric/CO alarm.

I could cover the downstairs with a dual ionization/photoelectric alarm since there is already a new CO detector in the area.

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