System Sensor announces they are discontinuing production of the model 1451 Smoke Detector:
(July, 2009) - System Sensor will no longer be manufacturing this model of ionization smoke detector as of September 2009 due to low sales volumes. Recommended replacement products are the 2151 photoelectric detector or any of the "i-3" series detectors. Please remember to check the compatibility requirements of your fire alarm system before replacing any detector (some actually caution against mixing ionization type and photo-electric units on the same circuit).

Smoke Detector Recall:
System Sensor is recalling a number of 400 Series thermal smoke detectors. Affected model numbers include 2400TH, 2412THB, 2424TH, 2451TH manufactured between March 29, 2004 and September 27, 2004. Please read the official notice for more information.