DIGITAL SECURITY CONTROLS DSC FSA-210B 2-WIRE PHOTOELECTRIC SMOKE DETECTOR

I purchased 7 of these as a replacement for some older DSC 220 detectors which were past there time. The units themselves were fine and installed easily. However, they were over a year (16 months) old which, of course, means that I'll be replacing them in 9 years rather than 10 so I'll only get 90% of the expected/recommend life. I've cleaned the oven since the installation and have no issues with excess sensitivity.