Quote:
Originally Posted by FredJacobs
The smoke alarms installed in our homes are photoelectric alarms. They work by detecting smoke from smoldering fires. I had ionization alarms installed in addition to the photoelectric alarms - they work by detecting smoke from flaming fires. I also had a rapid heat detector installed in the garage and the kitchen. This works by detecting an an increase in heat of 15 degrees in less than a minute. The best part - the ionization alarms and the heat detectors are monitored by an alarm company so I don't have to be home to call the fire department.
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In the newer houses (I think within the past 5 years or so) the builder is installing First Alert Model 9120B smoke detectors. These are "ionization" type detectors, not "photoelectric". Here is a photo of the Model 9120B detector. All the detectors will look the same, but one will say "smoke and carbon monoxide" on it. The rest will only say "smoke".