The System Sensor DUCTSD Series duct smoke detectors with a cover integrated smoke test port and flexible configurations provides efficient installation and maintenance.

• 4-Wire Photoelectric, integrated low-flow technology
• Air velocity rating from 100 ft/min to 4,000 ft/min (0.5 m/s to 20.32 m/sec)
• Versatile mounting options: square or rectangular configuration
• Cover integrated smoke test port
• Plug-in sensor offers the latest sensor technology
• Broad ranges for operating temperature (–4°F to 158°F) and humidity (0% to 95% non-condensing)
• Patented sampling tube installs from front or back of the detector with no tools required
• Increased wiring space with an added ¾-inch conduit knockout
• One easy-access Test/Reset button
• Patented interconnect feature for multi-fan shutdown
• High contrast terminal designations and wiring diagram label make wiring easy
• Built-in short circuit protection from operator wiring errors
• Two DPDT Form-C relay contacts
• 24 VAC/DC or 120 VAC
• Compatible with existing System Sensor duct smoke products, including remote accessories RTS151 and RTS151KEY