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1.08 VFS

Round air flow controller for standard application in variable volume systems, suitable for supply and return.

  • Suitable for volume flow rates up to 21,000 m³ / h or 5,800 l / s
  • Suitable for regulation of air volume, room or duct pressure
  • Electronic control components for various applications (Easy, Compact, Universal and LABCONTROL)
  • High control accuracy
  • Suitable for air velocities up to 10 m/s
  • Leakage when the control valve is closed according to EN 1751, class 3
  • Leakage from housing according to EN 1751, up to class


  • VSR-SW – Single Wall
  • VSR-DW – Double wall (50mm)
  • VSR-SA(S/R) – Double wall with integral sound attenuator
  • HWR – LTHW reheat coil round in- and outlet, 1-, 2- or 4-row


VAV units are used in air conditioning and ventilation systems to improve comfort and reduce energy consumption. The VAV unit is controlled by a thermostat or DDC controller and varies the air quantity based on cooling and/or ventilation needs. This results in considerable savings in fan energy because, with little or no cooling demand, the valve can be partially or even completely closed. The VAV unit can also be used for air quality control. Depending on the CO2 concentration, more or less fresh air is then supplied. The units are available in single and double-walled versions.



  • Housing; galvanized steel (275 g/m²), airtight according to class “B” NEN-EN-1507 and NEN-EN-12237. Class C available on request.
  • valve blade; sandwich construction, 1.5mm SBR sheet rubber with insert between 2 galvanized steel blades.
  • bearings; NYLON (PP6.6), maintenance-free
  • valve shaft; Aluminum ø12 mm
  • Operating temperature +5°C to +50°C
  • Storage temperature –5°C to +70°C


  • Accurate measurement from 1.0m/s air speed
  • Deviation +/-2% at 3xD straight approach (+/-10% at 1xD straight approach).
  • Average measurement over 8 to 24 measuring points according to Log-Tchebycheff method.
  • Amplification of measurement signal with at least 2.5x.
  • Extruded aluminum measuring profile.
  • Rounded measuring openings make the FloXact™ insensitive to skewed or turbulent flow up to 30º in all directions relative to the profile axis.

Control (optional)

  • Analog controller Belimo LMV-D3-MP (24VAC, 0(2)-10V input and output, 5Nm).
  • BACnet controller KMC BAC-800x and BAC900x.
  • Mounting of control equipment supplied free of charge (PRIVA, Honeywell, Siemens, etc.) possible in consultation.
  • All control equipment is fitted as standard on the right side (seen with the air direction) of the unit, unless stated otherwise when ordering.

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De Compagnie 22E