Wheelock Exceder LED3 520 Hz Low Frequency Sounders

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Industry-first to meet both NFPA 72 and NFPA 720 new code requirements for sleeping rooms

With the Exceder LED3 520 Hz low frequency sounder line, organizations can meet both sleeping room codes – NFPA 720 and NFPA 72 - with one device, which features two different sound patterns, T4 for CO and T3 for fire detection.  The low frequency sounders can replace a facility’s existing appliances, utilizing the same single pair of wires that are currently installed, offering a simple retrofit to meet new codes for sleeping rooms.

The Exceder LED3 low frequency sounders feature multiple 520 Hz modes of operation: T3, T4, Continuous, and T3/T4. When the device is set to T3/T4, the appliance can switch from T3 to T4 based upon the condition sensed by the fire alarm control panel.

Like the entire Wheelock Exceder LED3 product line, the LFHNK3 models feature one of the industry’s smallest footprints and a sleek, modern, low-profile design.

520 Hz sounder NFPA code requirements

Customer Success Story

UL Compatibility Letter for Exceder LED3

Catalog Number LFHNKR3-AL, LFHNKW3-AL, LFHNKR3-CO, LFHNKW3-CO, LFHNKR3-N, LFHNKW3-N
Finish Color Red or White
Mounting Wall or Ceiling
4 Settings in 1 Device T3 (fire), T4 (CO), Continuous (coded), T3/T4
Lettering ALERT, FIRE, CO, No Lettering
Backbox Mounting Options LFTP Trim plate for single-gang backbox included in all LFHNK models; LED speaker backboxes (LSPKBB) and 4” square backboxes
Approvals UL, ULC, CSFM, RoHS

Features

  • Meets dual low frequency sounder codes for sleeping rooms in a single device
    • NFPA 72 for fire alarm
    • NFPA 720 for CO alarm
  • Low-Profile Design and one of the smallest footprints with sleek, modern aesthetics
  • Convenient Mounting Options - LFTP Trim plate for single-gang backbox included in all LFHNK models; LED speaker backboxes and 4” square backboxes
  • Easy-to-Install with finger slide switches with no tools needed for setting changes 
  • Fast installation with IN/OUT screw terminals using #12 to #18 AWG wires