We got a call from a customer last week. “This Lint Alert Alarm keeps beeping! It must be broken!” We checked our records and found that our service company installed it last year after cleaning. When we arrived we found it was working perfectly…the duct was clogged with lint and needed a cleaning! Take it from someone whose house had a dryer fire (many many years ago), the Lint Alert can protect your home and family from dryer vent fires. it really works!