UL 217 Smoke Alarm Standard: 8th, 9th and 10th Editions Explained
Modern UL 217 added three tests no residential smoke alarm had to pass before: smouldering and flaming polyurethane foam fires, and a cooking nuisance test the alarm passes by staying silent. This guide covers how the 8th, 9th and 10th Editions differ, what NIST measured on real alarms, and whether yours must be replaced.
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