Well I'll be..My research turned up the same as IAMICHABOD.
I never was aware that the CO detectors should be replaced every 7-10 years till mine in the MH started chirping several months ago. Stuck a new battery in it then it started again the other day. Then I see the notice "replace after xyz." Did some reading and the light dawned in the dark continent. Dang, maybe should replace my who knows how old it is one in the S&B too.
From what I have read it is now recommended that smoke detectors be on the same replacement schedule.
