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Model FDO421 is Underwriters’ Laboratories Listed [UL268A Listed for direct in-air duct usage]
Simplex 4906-9256 TrueAlert Addressable Multi-Candela Speaker Strobe
Use direct replacement SLHSWW-F
Eaton Wheelock ASB-24MCW-NW Audible Strobe
• Ideal for industrial and commercial fire protection systems
Simplex 49SV-APPLW-O Addressable Speaker System Sensor HRL-LF Model FDO421 is Underwriters’ LaboratoriesSimplex 49SV APPLW O Addressable Speaker and speaker visible appliances are individually addressed and individually controlled with power, supervision, and audio from a compatible Simplex fire alarm control unit (FACU) A combination of an IDNAC Signaling Line Circuit (SLC) and a compatible audio (speaker) circuit are required for these appliances.