The InnovairFlex D4240 4-wire photoelectric duct smoke detector features a pivoting housing that fits both square and rectangular footprints and mounts to round or rectangular ductwork. This unit operates in airflow speeds of 100 to 4,000 feet per minute, temperatures of –4°F to 158°F, and a humidity range of 0 to 95 percent (non-condensing). A plug-in sensor head offers improved false alarm immunity and simple installation, testing, and maintenance. An improved cover design isolates the sensor head from the low-flow feature for simple maintenance.

Features
• 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
• Plug-in sensor offers superb false alarm immunity and 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 the front or back of the detector with no tools required
• Increased wiring space with a newly added ¾-inch conduit knockout
• One easy-access Test/Reset button and improved LED status
• Patented interconnect feature for multi-fan shutdown
• New high-contrast terminal designations
• Built-in short-circuit protection from operator wiring errors
• Field-selectable settings for configuring the detector
• Two DPDT Form-C relay contacts
• 24 VAC/DC or 240 VAC
• Backward compatibility with existing Innovair products, including remote accessories

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