Kidde KA-F Smoke Detector Quick Convert Adapter from Firex to Kidde (900-0149)

The adapter just misses fitting within the inner cut-out of the base plate that comes with Kidde smoke detector (KN-COSM-IBA). Product description of the adapter indicates that the adapter is for use with Kidde Model KN-COSM-IB but does not specifically list -IBA. There do not seem to be any other Kidde adapters that specifically list the -IBA model (which looks identical to -IB in pictures). I was able to modify the base plate of the -IBA by snipping out a small portion of the inner cut-out so that the adapter would fit. This seemed easier than redoing already existing ceiling harness wiring to accommodate the new pin configuration of the KN-COSM-IBA.

My Firex smoke detectors haves turned 10 years old and that’s the replacement cycle now. I purchased a new kidde/firex detector and they have a different clip connector and base plate. The new detectors do come with both the base plate and wire pigtail. If you don’t want to replace the older style wiring you can use this adapter to connect the new detector to the old wiring clip. It’s two screws to replace the backing plate and the holes are in the same place.

My only regret is not knowing in advance I would need the Kidde KA-F quick convert adaptor when I ordered the replacement smoke detector. I could have saved a few dollars buying them together. Nevertheless, this easily snaps right on to the older wiring harness, and plugs right in to the updated version of the smoke detector. One thing you might also check when you start installation is the ceiling connector ring. I assumed (incorrectly) that I could just twist the new detector on to the old ring. That wasn't the case. Though at least the ring comes with the detector.

Good product, however, some smoke/CO2 detectors can't mount with this connected. The detectors have a connection that is offset from the center, so when you put this on you sometimes can't fasten the connector to the mount. This is solved by using the wire adapters included with the detectors. However, sometimes you can mount the detectors with this connected and thus save a lot of time and trouble. So for those detectors, I give this 5 stars.

Absolutely worth buying this rather than rewiring. The alarm is question that we replaced was in a vaulted ceiling and would have been difficult to work on. We replaced a Firex 120-1182B alarm with a Firex I4618 and this adapter made it easy. 10/10 would do again.

Works Great! Second time ordering this product. Needed to replace an older Smoke Detector. The newer one required this Adapter. Easy install. If you don”t want to mess with re-wiring get this, just snap in - connect new detector, push test button and your all set. Time to install—-less than 10 mins. Oh yeah....remember to change battery as required for safety if you have a battery back up. 😁

Though a bit pricey, it is easy to use in order to quickly convert from older FireX to Kidde Smoke Detector. It fits securely and is easier than splicing wires to attach a Kidde wire harness.

It is too large to use in the Kidde combo unit. When installed to the combo unit the mounting bracket center hole is too small for it to fit through and let the unit twist on. I will have to enlarge the hole to get it to work.