SDP-3 Duct Detector Mounting Box including SDP-3 PIPE (0.6M)The SDP 3 is a Duct Probe housing allowing a range of photoelectric smoke detection devices, either conventional or analogue addressable, to be mounted on the outside of an air duct for the purpose of monitoring the air within the duct. Using an aspirating technique, the air within the duct is drawn via a pipe into the duct probes housing. This allows constant sampling with a standard, LPCB approved smoke detector, which makes smoke detection within