On Mon, 12 Dec 2011 03:43:07 -0800 (PST), Hank
wrote:

On Dec 12, 5:54Â*am, Frank Thompson wrote:
I've read that fire alarm systems need to be replaced on ten year
intervals. Â*I was wondering if all components need to be replaced in
my wireless system. The system includes smoke detection as well
sending alarm to local fire dept.
Included are smoke detector/transmitter, keyboard, and panel. Â*The
system is 12 years old. My initial thought was to replace all the
detector transmitters now. Â*Over the past year two of the detector/
transmitters (I have 4) have malfunctioned. Â*Should I replace the
other components?

I doubt that the whole system would need replaced. Read the manual for
your particular system. At most I would replace the smole detectors.
Smoke detectors can build up dust and debris inside them.

Hank
Even in a clean environment smoke detectors have a limited lifespan