The SD505-Duct Smoke Detector & Housing is engineered for active fire protection inside HVAC ducts, integrating a sophisticated addressable photoelectric detector with a sturdy enclosure. It supports high-airflow ranges and features a cover-test/reset button plus remote test capability for easy maintenance. This smart detector locates smoke in transit through HVAC systems and communic... https://www.quickshipfire.com/product/sd505-duct-smoke-detector-and-housing/