![Kidde Fyrnetics KF20 Firex White Mains Optical Smoke Alarm With Hush, Mounting Plate & Alkaline Battery Back-Up 230V - Shop4 Electrical Kidde Fyrnetics KF20 Firex White Mains Optical Smoke Alarm With Hush, Mounting Plate & Alkaline Battery Back-Up 230V - Shop4 Electrical](https://shop4electrical.co.uk/665967-medium_default/kidde-fyrnetics-kf20-firex-white-mains-optical-smoke-alarm-with-hush-mounting-plate-alkaline-battery-back-up-230v.jpg)
Kidde Fyrnetics KF20 Firex White Mains Optical Smoke Alarm With Hush, Mounting Plate & Alkaline Battery Back-Up 230V - Shop4 Electrical
![New Kidde FireX KF20 Mains Powered Optical Smoke Alarm Fire Detector with 9V Battery Backup : Amazon.co.uk: DIY & Tools New Kidde FireX KF20 Mains Powered Optical Smoke Alarm Fire Detector with 9V Battery Backup : Amazon.co.uk: DIY & Tools](https://m.media-amazon.com/images/I/71iRBt2Xn2L.jpg)
New Kidde FireX KF20 Mains Powered Optical Smoke Alarm Fire Detector with 9V Battery Backup : Amazon.co.uk: DIY & Tools
![Reviews for Kidde Firex Smoke Detector, Hardwired with nine-V Battery Backup & Front-Load Battery Door, Smoke Alarm, 4-Pack | Pg 4 - The Home Depot Reviews for Kidde Firex Smoke Detector, Hardwired with nine-V Battery Backup & Front-Load Battery Door, Smoke Alarm, 4-Pack | Pg 4 - The Home Depot](https://cf-images.us-east-1.prod.boltdns.net/v1/static/66036796001/6332998d-dbea-41fb-852e-569bf8a1b1f4/729a5650-ed07-43e6-9907-5b15d53e835e/1280x720/match/image.jpg)
Reviews for Kidde Firex Smoke Detector, Hardwired with nine-V Battery Backup & Front-Load Battery Door, Smoke Alarm, 4-Pack | Pg 4 - The Home Depot
![Kidde Firex Smoke Detector, Hardwired with nine-V Battery Backup & Front-Load Battery Door, Smoke Alarm, 4-Pack 21030967 - The Home Depot Kidde Firex Smoke Detector, Hardwired with nine-V Battery Backup & Front-Load Battery Door, Smoke Alarm, 4-Pack 21030967 - The Home Depot](https://images.thdstatic.com/productImages/656fcb7d-4d69-47b0-8ca2-245b8a7c2843/svn/kidde-hardwired-smoke-detectors-21030967-64_1000.jpg)
Kidde Firex Smoke Detector, Hardwired with nine-V Battery Backup & Front-Load Battery Door, Smoke Alarm, 4-Pack 21030967 - The Home Depot
![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 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](https://preview.redd.it/hi-im-going-to-attempt-to-replace-these-firex-smoke-v0-7nce6mtqp4ba1.jpg?width=640&crop=smart&auto=webp&s=1340cfc628de58869043d20931c649b82fa77299)
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
![Kidde Firex Smoke Detector, Hardwired with Battery Backup & Front-Load Battery Door, Smoke Alarm 21029877 - The Home Depot Kidde Firex Smoke Detector, Hardwired with Battery Backup & Front-Load Battery Door, Smoke Alarm 21029877 - The Home Depot](https://images.thdstatic.com/productImages/d7d550a0-5988-435d-8a62-382b5f3444e8/svn/kidde-hardwired-smoke-detectors-21029877-64_1000.jpg)
Kidde Firex Smoke Detector, Hardwired with Battery Backup & Front-Load Battery Door, Smoke Alarm 21029877 - The Home Depot
![How to Replace Hardwired Smoke Detector – Safely Update Your Smoke Detectors with Kidde FireX - YouTube How to Replace Hardwired Smoke Detector – Safely Update Your Smoke Detectors with Kidde FireX - YouTube](https://i.ytimg.com/vi/ZAqqbQOidh8/maxresdefault.jpg)