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There are many videos out there demonstrating how photoelectric smoke detectors outperform ionization smoke detectors in smouldering, slow burning fires, and showing that photoelectric detectors often sound an alarm more than a HALF HOUR before an ionization alarm sounds. But what about the reverse? How much more quickly will an ionization smoke detector sound before a photoelectric detector in an active flame fire? This test shows about 1 to 2 minutes earlier, which in a rapid fire may mean the difference between life and death before room flashover. Combination alarms that contain both kinds of sensors are most protective, and photoelectric alarms should be used in kitchens to avoid false nuisance alarms due to cooking, toasting, etc. Video from WAFB channel 9 story "Test of smoke detectors reveal which ones you can trust with your life" on February 26, 2015. Source: https://www.wafb.com/story/28204769/test-o...