While the importance of them is widely known, smoke and carbon monoxide detectors often become afterthoughts once they're installed.
Why do you Need Smoke Alarms for Your Business? - Landlord Safety
Carbon monoxide (CO) alarms
Oregon State Fire Marshal : Smoke CO Alarms : Fire Safe : State of
AudioLINK+
Tips for Testing Your Smoke Alarms - Home Security & Alarm Systems
Carbon Monoxide Detectors in the Workplace
Carbon Monoxide Testing: How to Test Carbon Monoxide Detectors
How to Install and Maintain Standalone Smoke Detector
Battery Powered Smoke & Carbon Monoxide Detector