Silent Knight SD505-AHS This is an analog heat detector. Brand Silent KnightModel SD505-AHSManufacturer Silent KnightType Heat Detector
Grinnell IXA-RMS Category : GrinnellThis unit was taken off of a TFX-400 system at Brigham Young University.
Space Age AV32 Category : Space Age ElectronicsI have no idea why there is no fire lettering on this unit