How to Replace Hardwired Smoke Detector – Safely Update Your Smoke Detectors with Kidde FireX - YouTube
Firex Smoke Detector, Hardwired with Battery Backup & Front-Load Batte – Denali Building Supply
Hi, I'm going to attempt to replace these Firex smoke detectors myself. can I just buy the most recent model of these and swap them out, leaving all the old wires? Or