The Grainger heat detectors are designed to activate an alarm upon detecting an abnormally high temperature. They use a fixed temperature or rate-of-rise detection method to identify fires. These devices are UL listed and FM approved, providing reliable fire detection. The heat detectors come in multiple styles including ceiling-mount, wall-mount and duct-mount options. Key features include LED operation indicators, low-profile designs and wide fields of detection. Overall, these heat detectors offer technologically advanced, compliant fire detection critical for protecting facilities.