All detectors have a life span, CO detectors accumulate within a filter, thus have an early replacement of 5 yrs (this includes your residential detectors) Smoke detectors have a life span of no more than 10 years, and I would suspect LP detectors have a life span between 5 ad 10 yrs, due to the technolgy utilized to operate. Always a good idea to change before they expire.
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Bill M
2012 Georgetown XL 360
2011 Chevy Equinox - 2006 Chevy Avalanche
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