Firex 428 FXW-R Smoke Detector and Alarm (120V wire-in) Ionization
The manufacturer suggests the following replacement.
Replacement: Kidde i12020.
Your current Quick-Connect Harness and Mounting Bracket (which are included with each new alarm) will need to be replaced. In addition, if you are replacing an interconnected alarm ALL alarms in the series must be replaced.
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Kidde/Firex alarm replacement suggestions come directly from the manufacturer. When installing these suggested replacement alarms into an existing interconnected system we recommend you contact the manufacturer with any compatibility questions and concerns.