The factory-installed 12A09 vent limiter (1/8" NPT) eliminates the need for external vent piping in indoor installations by limiting gas escapement in the event of a diaphragm rupture

maintaining tip geometry over extended duty cycles

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ensuring true ambient air measurement

streamlining the manifold layout

Johnson Controls P352PQ-1 Pressure Control Els PW 17895 The factory-installed 12A09 vent limiterThe Johnson Controls P352PQ 1 is a high precision electronic proportional plus integral pressure control designed for maintaining accurate static air pressure in commercial HVAC systems. This unit effectively manages a setpoint range of 0. 5 to 5 inches W. C., featuring an adjustable throttling range to match specific system requirements. Engineers and technicians utilize this controller to provide a stable 0 to 10 VDC or 0 to 20 mA analog output,