Bosch Security D341

Duct detector housing, 4-wire 24/120V
Four-wire duct detector housing that works with all 24 VAC/VDC or 120 VAC UL Listed four-wire control panels.

  • Factory New
Brand: Bosch Security Part #: 50278 Categories: , Manufacturer Part #: D341


The D341 Four‐wire duct smoke detector housings mount on the ducts of heating, ventilation, and air conditioning (HVAC) systems. The D285DH detector in the housing monitors the presence of smoke in the conditioned air. The housing works with all 24 VDC or VAC or 120 VAC, UL Listed four‐wire control panels. The efficient housing design samples the air passing through a duct and detects potentially hazardous conditions. When smoke is detected, the detector sends an alarm signal to the control panel or HVAC control equipment. The control panel or HVAC control equipment initiates the necessary action to control air handling systems.


Weight 4.67 lbs
Dimensions 4.25 × 6.50 × 15.50 in


Material Qualities

Fire Retardant, High Impact Resistance





Bosch Security

Production Status



  • For 1 ft. (30.5 cm) to 10 ft. (3 m) ducts with air velocity between 300 ft./min. to 4000 ft./min. (1.52 m/s to 20.3 m/s)
  • Easy duct tube installation through the housing cuts installation time
  • Detector test and reset without removing covers
  • Clear cover allows quick visual inspection
  • Tube filters, dust immune smoke detector, and easy disassembly for cleaning reduce maintenance time and cost


D341 Family four-wire duct smoke detector housings
Bosch Security – Data Sheet – 2018
Duct smoke housings, 4-wire; D341/D341P and D342/D342P
Bosch Security – Installation Manual – 2017
Two-Wire Smoke Detectors; D285 / D286 / D263 / D603 / D340
Bosch Security – Technical Service Note – 2002

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