Two-Wire Duct Detector SD-2W, Surface Mount Air Duct Alarm Sensor With 100mA Alarm Current And 70uA Standby, 7 3/4 Inch Long, 5.45 Inch High, 1 7/8 Inch Deep, Made In USA, HVAC Safety Equipment

Two-Wire Duct Detector SD-2W Surface Mount HVAC Alarm
✔️ Single unit, 100 mA alarm current, 24 VDC, 7-3/4in long

High-performance duct detector designed for surface mounting in HVAC ductwork. It monitors air flow and detects smoke or contaminants early, helping protect occupants and equipment. Ideal for commercial and industrial installations, with UL, ULC, CSFM certifications and Made in USA quality.

✅ Model SD-2W two-wire duct detector for surface mounting
✅ Alarm current 100 mA; standby 70 µA; 24 VDC supply; length 7-3/4 in (197 mm)
✅ Dimensions: L 7-3/4 in (197 mm) x H 5.45 in (138 mm) x D 1-7/8 in (47.6 mm)
✅ Ambient temp range -4 to 158 °F (-20 to 70 °C); air velocity 100 to 4000 fpm
✅ Alarm auxiliary contact 2 A @ 30 VDC; humidity up to 93% RH
✅ UL, ULC, CSFM approvals; Made in USA

💡 What is a duct detector used for in HVAC safety systems? - Detects smoke or contaminants in ductwork and triggers alarms to warn and isolate the affected zone. - Handy for commercial HVAC to meet safety codes and protect occupants. - Integrates with two-wire systems for automatic control and alerting.