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Ann Doumit
Reviewed in the United States on March 7, 2025
Great and super easy to install.
Bourne_again
Reviewed in the United States on February 7, 2017
I had an older model BRK 4120B, about 10 years old, which only has one type of sensor. Ionization Smoke Alarms work best at detecting minute particles of fast, flaming fires, but there’s a tradeoff. These typical perform poorly in detecting smoky or smoldering fires. Ionization units have been reported to “false alarm” from charred food, liked an over-nuked pizza, while cooking.Photoelectric Smoke Alarms excel at detecting the bigger particles found in smoldering fires. Photoelectric units generally produce fewer “false alarms” from cooking, but react quickly detecting the smoldering fire types.The First Alert BRK 3120B offers the best of both worlds, using both Ionization and Photoelectric sensors. This way, you’ll get an alarm that detects either type of fire. Some newer Smoke Alarms, except the combo units, also have a built in CO Alarm. At first blush, I thought this might be the way to go, but call me old school, in that I believe it’s better to keep things simple, by having separate Smoke Detector and CO Detectors. Especially, since there are no combo smoke detectors and CO alarms all built in the same unit. My analogy is like when TV’s with integrated VCR’s first came on the scene. (I said I was old school). The TV make work fine, but if the VCR craps out – or vice versa, then you’re faced with a bit of a challenge, an also a higher repair cost, since all the componentry is smaller since it must all fit into the TV “box.”I also checked the rating for the BRK3120B and the Kidde PI2010, also a combo unit. I went with the First Alert because it offered the same reported lab performance at cost savings compared to Kidde. I need 12 alarms, so the cost savings essential got me 12 for the price of 10 from the other guys.Installation was especially easy, since the BRK uses the same size mounting ring (and the quick connect cable) as the ones I am replacing. Not a big deal, but nice nonetheless. Also, maybe a minor point, but the BRK 3120B uses 2 AA Alkaline batteries, compared to the more expensive 9V for the Kidde units. Lastly, be sure to replace any brand of smoke detectors after 10 years from their manufacturing date (usually found on the back of the alarm). Good Luck - I hope this helps.
Mark R.
Reviewed in the United States on February 13, 2017
This was easy to install. It's so much easier to attach the detector to the mounting plate than my old smoke detectors! I really like the latch feature that makes it easy to identify which detector triggered an alarm or a low battery chirp. I also like that it uses AA backup batteries, which are much cheaper than the 9V batteries my old detectors used.I used these detectors in most of my house. I also put one on each floor for CO detection. The 3120B is great because it's a dual sensor detector. The two models interconnect successfully so any detector can trigger an alarm from all of the rest. (The compatibility is assured in the 3120B instructions. And I tested it myself, too.) If one of the talking detectors is the one that detects a problem, a voice will announce if it's smoke or CO. If one of the non-talking alarms detects a problem, there won't be any voice announcement. When that happens, we know it must be smoke.UPDATE: I installed these detectors about a year and half ago. They are very, very sensitive. They've gone off twice so far. I'm pretty sure the first time was caused by trace amounts of smoke that entered the house from a fire far away. I could barely smell it, but only outside. I don't know what caused it the second time, but I suspect it was dust because there's a lot of air movement in the room where the alarm was triggered.SECOND UPDATE: The detector that was giving me false alarms is next to a door that tends to accumulate a lot of dust due to the way the HVAC system moves air through the house. The detector is right in the stream of air that leaks around the door when it's closed. I started cleaning the dust of the doorframe and door edges once every few months, and I haven't had a false alarm since then.
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