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.