Siemens HFP-11 Category : Siemens The protective layer over the vents on the side of the detector is made out of a really thick fabric. It’s kind of weird. Brand SiemensModel HFP-11Manufacturer SiemensType Detector
System Sensor P4R Category : System SensorUnlike my System Sensor P2R, this alarm does 4-wire operation.
Grinnell TFX-912P Category : GrinnellJust like the rest of my Grinnell equipment, this smoke detector is from Brigham Young University.
