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Static pressure sensors used to control VAV fans shall be located such that the controller setpoint is not greater than 1.2 inches w.c. (299 Pa). Where this results in one or more sensors being located downstream of major duct splits, not less than one sensor shall be located on each major branch to ensure that static pressure can be maintained in each branch.

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3.3.210 Definitions, Static Pressure
The pressure that exists at a given point under normal distribution system conditions measured at the residual hydrant with no hydrants flowing. [24 ...