Smoke detectors should be mounted at least how far from a wall?

Mounting smoke detectors at least 4 inches from a wall ensures optimal air circulation around the unit, which is crucial for accurate and timely detection of smoke. When smoke alarms are too close to walls, they can be less effective because the airflow necessary for the device to detect smoke may be restricted. This distance helps in minimizing potential false alarms from drafts or air currents that can push smoke away from the detector. Additionally, following manufacturer guidelines and local building codes often specifies this distance to enhance safety and efficacy in smoke detection.