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Question About BRK electronic Smoke Alarm 4120B
I have model 4120 B alarms, that are over 11 year...

I have model 4120 B alarms, that are over 11 years old ? I have one that has gone bad, shouls I replace them all (I have seven in the house} and if so what model that would be the same type,

Asked by John Ott on 02/10/2012 2  Answers

ManualsOnline posted an answer 12 years, 9 months ago

The ManualsOnline team has found the manual for this product! We hope it helps solve your problem. Get the Manual Here

colin posted an answer 11 years, 5 months ago

0 i recommend you replace them with 9120b because i installed 3 9120b's to replace the 86rac.
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