said by pende_tim:
So if this went into effect in 3/2007, 7 years from that date would be 3/2014. Any detectors manufactured under UL 2034 should have 18 months "life" left.
Not saying that some manufactures did not adopt this standard before it became official.
But this aside, for the price of a detector VS your safety, spend the $40.00
I have a unit that's EOL manufactured in 2004. It started chirping this year so I know Kidde started adding that feature in 2004 at least to some units.