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Mike G.
Mike G., Master Electrician
Category: Home Improvement
Satisfied Customers: 7535
Experience:  Proven Professional 48 years Experience
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We are replacing our old Firex Model FX 1218 smoke detectors.

Customer Question

We are replacing our old Firex Model FX 1218 smoke detectors. Our smoke alarms are tied into a home system. They are hardwired and have batteries. I keep seeing replaced by bigger numbers.

What should I be buying? I need 30.
Submitted: 6 years ago.
Category: Home Improvement
Expert:  Mike G. replied 6 years ago.
I need some clarification on exactly what you have for detectors. If they have batteries then the aren't directly tied into a alarm system with a central station monitoring. There may be a set of contacts that were installed by the alarm installer is all. This being the case if you purchase 30 detectors with an interconnect and a battery, any would be fine, they all work the same. Kidde (Firex) has always been as good as you would expect.
Customer: replied 6 years ago.
Your answer is not correct. Again the old Firex Model FX 1218 has a battery and it is a 120/AC plug into hardwired electric system. The battery is the backup. I thought you would find out what replaced this model. It moved thru the years to a 4618 and I cannot tell if now it is a Kidde 5xxxx something. I am looking for specifics due to the volume and most smoke alarms cannot be returned. Most will work is not what I was looking for.
Expert:  Mike G. replied 6 years ago.
What you expected and what the facts are seem to be at odds. Any hard wired smoke detector is required to be paired with a like kind. Over the years they have been improved and the old ones are not compatable. If you're replacing them all, then all I suggested was that Firex is now part of Kidde and all you need do is buy 30 of the same model number. I would also caution you that Kidde/Firex had a recall some time back and that you should be careful as to where you buy them.