Smoke was used to test a couple of First Alert smoke alarms side-by-side. The made-in-the USA, 37-year-old SA76RS responded in seconds before the made-in-Mexico, new SA320 did The old alarm had a continuous, very loud horn, while the new alarm sounded with a series of beeps. Before going through the hassle and expense of arbitrarily replacing smoke alarms per some rule-of-thumb, it appears to make sense to check existing alarms with a little smoke.
6 сен 2024