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Model # 21007581

Internet # 202029419

Store SKU # 343598

Hardwired 120-Volt Inter Connectable Smoke Alarm with Battery Backup

This item has been discontinued.
The Home Depot no longer carries this specific product.

$14.97 /each
  • Easy to install
  • Access to the battery is well designed
  • Battery backup




Model # 21007581

Internet # 202029419

Store SKU # 343598

Store SO SKU # 198092

FireX i4618 alarm is a 120V hardwire smoke alarm and battery back-up feature. Utilizes ionization technology that may detect fast flaming fires sooner than photoelectric. Install this alarm in your home to provide you and your family an early warning in the event of a fire. Battery back-up feature provides protection even during power outages and the smart hush feature will silence false alarms.

  • Front loading battery feature for easy battery change, no need to remove the alarm from the ceiling
  • Test/reset button allows you to check on the sensor's functionality and cease false alarms
  • 9-Volt battery backup provides protection during power outages
  • Pre-stripped wiring harness with easy off cap provides easy access to wiring components
  • Inter connectable feature with up to 24 devices of which 18 can be initiating
  • Unit is equipped with piezoelectric horn that is rated at 85 dB at 10 ft.
  • 9-Volt battery (21025830)

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Alarm Sensor Type 
Alarm Type 
Alarm/Detector Features 
Battery Back-Up,Hush Feature,Interconnected 
Commercial / Residential 
Commercial / Residential 
Connector/Contact Type 
Power Source 
Voltage (volts) 
Warranty / Certifications
Certifications and Listings 
1-UL Listed 


Rated 4.2 out of 5 by 137 reviewers.
Rated 4.0 out of 5.0 by Problem with 1 out of 3 purchased I replaced 3 20 year old interconnected alarms with these. 1 of the 3 alarms did NOT activate the other 2 alarms. I called the FireX customer support line. They insisted my house wiring was bad and told me to get a licensed technician. I disagreed with them since my 20 year old ones still worked when I took them down. They we adamant that it was not the alarm problem (very frustrating). After much testing / troubleshooting I was able to determine the one unit was bad. I went to HD to get the one bad unit exchanged. The exchanged unit worked properly. Bottom line is that if I were not a Do-it-yourselfer I would have been talked into hiring a electrician. October 6, 2015
Rated 5.0 out of 5.0 by Great basic smoke alarm. This is a great basic smoke alarm at the right price. Easy installation and looks good. I have had no nuisance alarms. This alarm is interconnected to all the alarms in my house. If one alarm is activated, they all alarm. November 18, 2013
Rated 1.0 out of 5.0 by Buy a better Alarm Bought two of these alarms to replace the orginal detectors that were 30 years old. After only two years of use, one of the alarms started late night and early am false alarms. Following the instructions the alarm was blown out with compressed air on three different occasions. The alarm STILL gives off false alarms. It's made in China and recommended to be replaced every ten years. I only got two years before it failed. May 6, 2015
Rated 2.0 out of 5.0 by Second one This is a replacement, the first one only lasted about six months and then began to chirp as if it needed a new battery, which it did not because after replacing the battery it started to chirp again. The unit is very sensitive to cooking odors/smoke from the kitchen when the alarm is in a hallway passing through kitchen and dining room. September 8, 2015
Rated 4.0 out of 5.0 by Good product Good product but keeps going off if it is near a cooking area. It also was chirping every 30 seconds and it was chirping at midnight. March 7, 2015
Rated 1.0 out of 5.0 by You get what you pay for I bought 2 of these as replacement for 7 yr old cheap builder grade alarms that the house came with. The $4 alarms that the builder put in, obviously, lasted 7 years. These lasted 6 months. Out of the 12 alarms in the house, these 2 new ones would go off like there was actually a fire. No smoke from cooking, no cigarette smoke, nothing going on to make them. I replaced the batteries, they still went off. I flipped the breaker for the entire system, they still went off. I bought them because I was being cheap at the time. I know better now. Steer clear. November 12, 2015
Rated 3.0 out of 5.0 by Poor reliability The Kidde smoke alarms are highly subject to false alarms. I have tried both ionizing and photovoltaic sensors. The ionizing smoke alarms caused three false alarms in a week but it could have been a wiring problem with one of nine alarms. Everything would be fine for 24 to 36 hours and the alarm would go off again. The alarm goes off in the middle of the night and wakes everyone up. The only solution is to replace the offending alarm. They can't be taken apart to clean them. I switched to photovoltaic sensors about 9 months ago and I have had only one false alarm but that is one too many. My recent purchase was for a smoke alarm with an ionizing sensor since it was on sale and I needed a backup in case of another false alarm. November 10, 2015
Rated 1.0 out of 5.0 by 2 of my 6 i-4168 firex alarms failed within one year I installed 6 of these firex smoke alarms and two have failed within 1 year. The defective alarms started chirping about every 2 minutes. The batteries were tested good and there was no dust present. November 7, 2014
  • 2015-11-26 T12:23:55.090-06:00
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