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Gentex Hard Wired Smoke & Carbon Monoxide Alarm with Backup

Gentex Hard Wired Smoke & Carbon Monoxide Alarm with Backup
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Gentex Hard Wired Smoke & Carbon Monoxide Alarm with Backup


The Gentex GN-503F is a combination photoelectric smoke and electrochemical carbon monoxide (CO) alarm for use as an evacuation device in all dwelling units, including but not limited to homes, apartments, hospitals, and hotels/motels. The GN-503F is engineered to eliminate nuisance alarms and deliver outstanding performance wherever reliable smoke and CO protection is required. The GN-503 is ANSI/UL 217 and ANSI/UL 2034 listed and in compliance with NFPA 72 and NFPA 720.

Also known as

  • CO & Smoke Combination Alarms: Gentex Smoke Detectors Hardwired Interconnected P
  • Gentex Corp. SMOKE/ CO ALRM W/ RELAY 120 VAC/ - GN-GN503F
  • Gentex GN-503F Smoke & Carbon Monoxide Alarm, 120V Hardwired Interconnectable Ph


  • 120VAC with 9VDC battery back-up
  • Temporal 3 evacuation piezo horn with a 3100Hz (nominal) horn frequency for smoke annunciation
  • Temporal 4 evacuation piezo horn with a 3100 Hz (nominal) horn frequency for CO annunciation
  • Form A/form C relay contacts
  • Relay contacts operate when on battery back-up
  • Push button self test feature
  • DualinkFeature: tandem with all Gentex tandem capable alarms
  • Quick disconnect wiring harness
  • Dust cover to prevent particle contamination during installation
  • Low or missing battery indicator
  • End of life signal indicates CO sensor has reached depletion state and time to replace
  • 1 year warranty from date of purchase
  • 85dBA alarm horn at 10 feet.
  • 120VAC with 9V battery backup.
  • Auxiliary Form A/Form C relay contacts.
  • Relay contacts operate on battery backup.
  • Push button functional test feature.
  • Non-latching (self restoring) alarm.
  • Meets state, federal, and ADA requirements.
  • Connect up to a maximum of 12 Gentex GN-503 combination smoke/CO alarms.
  • 9V battery backup; CSFM listed.
  • Item Weight - 2 lbs.


Product Height (in.)  6.25
Product Depth (in.)  1.8
Product Width (in.)  6.25
pdf documents - Installation Guide  01a15216-0d14-4fd3-aa0e-59def4230d67.pdf
pdf documents - MSDS  9af45bc9-9016-4ca8-824e-6d20365ada30.pdf
Certifications and Listings  1-UL Listed
extraImages  ["http:\/\/i5.walmartimages.com\/dfw\/dce07b8c-ac24\/k2-_ac3eba0b-4e7a-4231-bea4-4401e6cca077.v2.jpg"]
localExtraImages  []
DUALINK differentiating tones  T3 temporal smoke alarm, T4 temporal carbon monoxide alarm
Weight  1.13

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