Abstract: A fire sprinkler system is described which includes a piping system having at least one dual-use pipe providing both an air conveying inlet and a fire extinguishing fluid conveying outlet. The pipe has at least one air sampling opening allowing ambient air flow into the pipe and at least one fire sprinkler for ejecting a fire extinguishing fluid from the pipe in the event of a fire. An air sampling detector is fluidly connected to the pipe and tests the ambient air within the pipe to detect the presence of the fire. A valve, disposed between the source of the fire extinguishing fluid and the pipe, is in communication with the air sampling detector and operable to open, upon detection of the fire based on the ambient air tested by the air sampling detector, in order to fill the pipe with the fire extinguishing fluid.