DIThe published smoke-alarm replacement
First Alert SM105-AC Replacement Service
Detector Inspectors specifies the First Alert SM105-AC for its published hardwired smoke-alarm replacement. The service price is $65 per unit, including the alarm, parts and labor.
Core features
The manufacturer describes the SM105-AC as a hardwired smoke alarm with interconnect support, a sealed 10-year battery backup, test/silence control and an end-of-life warning. Always use the current manufacturer instructions for installation and compatibility.
Why sealed backup changes maintenance
The sealed backup is designed to cover the unit’s service life, so there is no annual replaceable backup battery. The alarm still requires regular testing and must be replaced at end of life.
A model page is not an installation decision
The existing alarms, connector, interconnect and placement still need review. Call Detector Inspectors for an assessment rather than ordering from a model name alone.
Safety references
Primary sources used for this page:
Manufacturer instructions and current local requirements control. For an emergency, call 911.