Terminal Unit Sizing – Inlet Valves

All variable air volume (VAV) terminal units—including single duct, bypass, system powered induction, fan-powered or dual duct—have a common function: regulate the amount of primary air entering the terminal unit.

This control of the primary air volume can be used for the following purposes:

  • Occupied space temperature regulation
  • Discharge air pressure regulation
  • Discharge air temperature regulation
  • Mixing of primary air with return air in an induction terminal

The primary air valve assembly contains an inlet tube, damper and air flow sensor. When sizing a terminal unit inlet, HVAC designers aim to minimize the sound generation of the terminal unit, as well accurately resolve the flow signal at both full and minimum cooling.

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