Photoelectric Duct Smoke Detector Kit. Kit comes with a D340 Duct Smoke Detector Housing, a D285DH Photoelectric Duct Smoke Detector Head, and a D344-1.5 Sampling Tube.

The D340 Duct Smoke Detector Housings mount on the ducts of heating, ventilation, and air conditioning (HVAC) systems to monitor the presence of smoke in the conditioned air. The housing works with the D285DH Photoelectric Duct Smoke Detector Head. 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 that initiates the necessary action to control air handling systems.

The D285DH duct detector head detects the large smoke particles which typically result from wood, paper, and fabric combustion. The detector is part of a two component system: the duct detector housing and the duct detector head. The housing is permanently attached on the duct. The interchangeable duct detector head quickly detaches for replacement and cleaning without affecting circuit wiring.

The D344-1.5 from Bosch is a duct sample tube 1.5 feet.

D340 Features:

• 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

D285DH Features:

• Commercial or residential applications
• Two-wire or four-wire application, depending on base
• Chamber Check rapid-flash LED Automatic Trouble Indication reports contaminated chamber
• Flashing LED power indicator