Gentex GN-503FF Hard Wired Smoke/Carbon Monoxide Photoelectric Alarm with Backup

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  • Regular price $84.78

This is a combination photoelectric smoke alarm and electrochemical sensor carbon monoxide alarm engineered to virtually eliminate nuisance alarms and deliver reliable smoke and CO protection. It has two set of contacts that activate independently for smoke and CO annunciation.

This combination smoke and carbon monoxide alarm is hard wired with battery backup for reliable notification in homes, apartments, hospitals, hotels, motels and other commercial properties. This is a photoelectric single station smoke alarm with electrochemical sensor carbon monoxide alarm. 


  • 85dBA alarm horn at 10 feet
  • 120VAC with 9V battery backup
  • DUALINK® differentiating tones: T3 temporal smoke alarm, T4 temporal carbon monoxide alarm
  • Two sets of Form A/C relay contacts activate independently for smoke and carbon monoxide events
  • Relay contacts operate on battery backup
  • Push button self test feature
  • Push button functional test feature
  • Non-latching (self restoring) alarm
  • Low battery or missing battery indicator
  • Meets state, federal, and ADA requirements
  • Quick-disconnect wiring harness
  • Connect up to a maximum of 12 Gentex GN-503FF combination smoke/CO alarms
  • 9V battery backup
  • UL Listed (USA); CSFM listed