How do I know how old my smoke detectors are?

You will need to remove the smoke detectors from their bases to see the information on the back of the detectors.  There should be a sticker or a stamp with the manufacturing date.  For example, the date may be listed as "2013 Nov. 05". If you are unable to find a date located on the back of the detector, then the detector is very old.   As smoke detectors age, the detector also turns yellow.  Smoke detectors need to be replaced if the date is over 10 years old.  

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1. I am selling my house. How do I schedule a smoke detector inspection?
2. What forms of payment are accepted by the Fire Department for permits and inspections?
3. How do I know how old my smoke detectors are?
4. What do I need to bring to the Fire Department for a plan review for construction of a new house or renovation to my current house?