I had doubts about the functionality of this device, so I ran a "smoke test" on the device right out of the box. Glad I did because he didn't warn me at all, even when copious amounts of smoke were pouring into the intake ports. Just for comparison, I ran the same test on a known good alarm and it responded with loud beeps a few seconds after some of my smoke got in. Don't risk your family's safety. Avoid this fear.
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