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The pattress is used when the installer has limited or no access to the back of the detectors. The cable is then delivered down through the ceiling to supply the detector. If this is is not possible, maybe due to a concrete partition between the floors, a universal pattress can resolve the problem.
By using the patress it allows cable to be connected through the side of the unit. A universal pattress surface mounting for Smoke/Fire Alarm Sensor is for use with the HSA/PE and HSA/HE.