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FRU is a measuring unit with a measuring cross, which is used for measuring volume flow in circular ducts.

FRU is equipped with Belimo VRD3, providing an output signal that is proportional to the volume flow. FRU can be used to monitor the actual airflow or can be used to control a volume flow regulator.

FRU is equipped with Lindab Safe in the front for connection to the duct and a female coupling in the back, and is ready for insulation up to 50 mm.

FRU can be installed in any position without requiring adjustment.

To avoid contamination of the measuring cross, FRU should only be used for clean air.

FRU needs a certain distance of straight duct before the unit and this has to be observed to obtain a stable and accurate airflow regulation.

  • Requires minimal initial pressure (Less than 20 Pa at Vnom)
  • Output signal indicates actual volume flow

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