Keeping Smoke Detectors Reliable: Why Dirt and Dust Are Your Worst Enemies
This article was previously published on 1/20/2017 and updated on 6/3/2025 How Photoelectric Smoke Detectors Work and Why Dust Trips Them Photoelectric, or photoelectronic, smoke detectors use a simple but powerful principle: they shine a beam of light inside a sensing chamber and watch to see when particles …