Silent Knight SD505-DUCT 23/02 and is compatible with various

and is compatible with various Det-Tronics transmitters and controllers

Rotary-decade switches are provided for setting the sensor’s address

T7350M Communicating Thermostats control 24 Vac commercial single-zone multistage conventional

The Cooper Wheelock WBB-R is a high-quality weatherproof back box

eBay Product Description

Silent Knight SD505-DUCT 23/02 and is compatible with variousThe SD505 DUCT addressable duct smoke detector is a heavy duty detector housing with the SD505 APS addressable photoelectric smoke detector pre installed and is used for detecting smoke and products of combustion present in air moving through HVAC air handling systems.