Smoke & Carbon Monoxide Detectors

The First Alert Smart ZCOMBO-G (1039833) is part of the Smoke & Carbon Monoxide Detectors test program at Consumer Reports. In our lab tests, Combination Smoke & Carbon Monoxide Detectors models like the Smart ZCOMBO-G (1039833) are rated on multiple criteria, such as those listed below.

High CO levels High CO levels rates a model's response to CO in air of approximately 400 parts per million.

Low CO levels Low CO levels rates a model's response to CO in air of approximately 100 ppm.

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