The Kidde SD-T120 SuperDuct Air Sample Tube, measuring 120", is designed for duct smoke detectors, offering a compact profile of less than 2" deep for effortless installation in tight spaces. It features a PCB-mounted photoelectric sensor equipped with advanced on-board intelligence for reliable smoke detection. The device incorporates patented differential sensing technology to provide environmental compensation, ensuring accurate and consistent performance. Ideal for maintaining safety in constrained areas, this air sample tube is a smart choice for effective smoke detection. Don't miss out on enhancing your safety system with this efficient and space-saving solution.