The Grainger website features marked fire alarm system components including pull stations, heat detectors, smoke detectors, notification appliances, and accessories. These components are UL listed and FM approved, and are designed for commercial fire alarm systems. The pull stations, detectors, and appliances provide visual and audible notification in the event of a fire. The accessories include items like wire and cable, junction boxes, and mounting hardware to facilitate installation and wiring. Overall, this is a reliable source for certified alarm system parts to build and maintain commercial fire detection systems.