Just because Simplex-Grinnel is the largest fire suppression service company in hte world does not mean anything. See in the news that the CEO of TYCO is in court for theft?
Why would any one run the detector cable in the top of hte duct? None of the companies I am certified to service require that set up in the service manuals. Years ago, we were allowed to put the detectors as much as 20 feet downstream, but the top of the duct? Were the specs for the system written by an archetech?
Douglas Hicks
General Fire Equipment Co of Eastern Oregon, Inc