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First Alert 3120B Smoke Detector

Ratings Scorecard

Test Results

Flaming fires

Flaming fires

Flaming fires is response time to paper fires with little smoke.

 /  5
Smoldering fires

Smoldering fires

Smoldering fires is response time to wood-fed smoky fires.

 /  5

About

The First Alert 3120B is part of the Smoke & Carbon Monoxide Detectors test program at Consumer Reports. In our lab tests, Smoke Detectors models like the 3120B are rated on multiple criteria, such as those listed below.

Flaming fires Flaming fires is response time to paper fires with little smoke.

Smoldering fires Smoldering fires is response time to wood-fed smoky fires.

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