System Sensor D4120 Detector Freon Enhanced Durability: The convex disc

Enhanced Durability: The convex disc design and galvanized steel construction resist corrosion and mechanical stress

Universal Compatibility: The interchangeable hub system fits various bore sizes (1/4" to 3/4")

The internal silicone seat and alloy steel plated spring are protected by a fabric-reinforced molded diaphragm

Verify with the manufacturer’s specifications to ensure a secure mechanical connection

while the 5°F to 15°F differential prevents short-cycling of the heating element

System Sensor D4120 Detector Freon Enhanced Durability: The convex discThe System Sensor D4120 is an industrial grade 4 wire photoelectric duct smoke detector designed for high performance smoke detection in HVAC air handling systems. This InnovairFlex duct smoke detector operates across a wide air velocity range of 100 to 4,000 feet per minute, making it suitable for both low flow and high volume applications. It features a versatile pivoting housing that accommodates square or rectangular footprints and mounts easily