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Price is what we paid in December 2013.
About our test
Our test was conducted in the fire laboratory of the Building Research Association (BRANZ). We purchased 3 examples of each model. Our results are the average of the performances of the 3 examples.
The alarms were fixed to a ceiling panel in a mocked-up hallway adjacent to the door opening of a fireproof room (which was about the size of a single-car garage).
In both tests, the smoke density was measured at the location of the alarms using a laser light-source and detector.
15 Jan 2017, Michael F.
Product use: 6 months or more
Bought it based on a Consumer test 4 years ago and it worked well until the end of 2016. Started beeping in the middle of the night, the batteries were good. Took it down and cannot get it to work no matter what I do.
Started beeping in the middle of the night, the batteries were good. Took it down and cannot get it to work again. I came back to find a replacement but the top model in the test has the same problem.
I have other single sensor alarms bought at the same time which have never malfunctioned.
Maybe, it depends on what you're after.
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