Pay in 4 interest-free payments of $29.75 Learn more
Ships within 48 hours · Estimated delivery Oct 7 - Oct 12
Fast and precise – Long-lasting bi-metal blade for efficient cutting
and primary listening areas
265+ compression for efficient storage
It automatically monitors phone line voltage
Includes nails for secure surface mounting
System Sensor D4120W Brilliant Fast and precise – Long-lastingSystem Sensor D4120W Watertight 4 Wire Photoelectric Duct Smoke Detector System Sensor D4120W Watertight 4 Wire Photoelectric Duct Smoke Detector is designed for reliable smoke detection in HVAC duct systems exposed to harsh indoor and outdoor environments. Its NEMA 4 rated enclosure and low flow sensing technology ensure accurate performance while simplifying installation, testing, and maintenance. NEMA 4 watertight enclosure rated for protection
