Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: I am replacing old Firex Model G-6 hard wired smoke alarms.. will this unit work for it? Is it better if I change all of them in one go?
Document: My home was built with Firex brand hard wired alarms. They should be replaced about every ten years, and it has been nine. I ordered these to replace the old ones. I had hoped the installation would be just plug and play, but both the mounting bracket and the wiring plug has changed from the older design, so it took a few minutes and a screwdriver to install each alarm. They work and so far no false alarms.
PROS:Good general purpose household smoke alarm.It is designed to be wired to other alarms, which all sound off if one of them is triggered.It does come with a 9v battery included, the mounting brackets and wiring harness.CONS:New wire harness (no compatible with older models of the same brand)Base is not strong enough to handle force required to twist on the smoke alarm. It bends or strips out of the attachment screws.I replaced the similar FireX model which was 13 years old.
Did Kidde really have to change the connector? The new one doesn't appear to be any better. The adapters are harder to install than you might think, and if I were to do it over again I would not mess with the adapters and instead I would turn the breaker to the smoke alarms off, remove the old connector/pigtail and install the one that came with the new smoke alarm.
These work great to replace old hard-wired units of the same type. I had/have five of the old ones in the house, all original to the 2000 construction. After 13 years of service, they've one by one started to chirp the &#34;low battery&#34; chirp no matter if they have a new battery or not, so I ordered these as a direct replacement. No problems getting them in.
Works as advertised. Installed five and no duds so far. The flange or base is about 1/2" wider in diameter compared to the ones I replacing from ten years ago. That's good for covering imperfections around the old mounting hole. It is annoying to have to change all the connectors because the plug style is different. I take that opportunity to ensure all the connections are done properly for better reliability.
Our house was constructed with 6 Firex smoke detectors hardwire linked. This is code in our town for new construction. After 8 years, one of the detectors started going off randomly. I called the Firex support number and found out that Firex had been bought by Kidde. Kidde still makes the Firex brand, but the new Firex detectors have a different connector and are not compatible with the old Firex detectors. As a result, I had to replace all the detectors to keep the linked system operating as designed.
I ordered 8 Kidde I5000 smoke detectors. The box shows "series i5000" on the front and "Model# i4618" on the side. The i4618 is a much cheaper unit.For what I can find out on the Kidde website is the the difference is a 5 year warranty vs a 10 year warranty and the i5000 comes with an Alkaline battery. Also, according to KIdde the i5000 are not sold individually but only in 6 packs.
Great product! Arrived intact, on time and perfectedly matched the units I replaced. No drilling, no retooling and no hassle. I replaced all 6 of my smoke detectors in about 15 minutes. A great new  addition to the design is the easy battery replacement  and the 'silent' button. I would highly recommend Firex/Kidde to anyone replacing, or installing ,new smoke detectors.
I replaced all four of these in my home at the same time. The old ones (11 years old) with the same model number. The new alarms had a slightly different wire plug in connector. The AC wires had to be moved to the new connector and that might require a qualified electrician. Replacing all four at once left the system balanced and the chirping stopped. Also, these smoke alarms came with backup batteries.
These seem to work as advertised. I bought these to replace my Kidde KN-COSM-B Battery-Operated Combination Carbon Monoxide and Smoke Alarm with Talking Alarms. My old alarms were beeping... so I changed the batteries in them, but they kept on beeping. I did some research and learned that the smoke alarms that come with carbon monoxide detection will constantly beep after about 5 years because they need to be replaced due to the carbon monoxide sensor inside the unit needing to be replaced.
Answer: yes