July 4, 2022
July 6, 2022



VAV dual duct terminal units for dual duct systems with variable volume flows in buildings with demanding acoustic requirements

  • Individual temperature control for each room or zone
  • Highly effective integral attenuator
  • Electronic control components for various applications
  • Closed blade air leakage to EN 1751, up to class 4
  • Casing leakage to EN 1751, Class B

Optional equipment and accessories

  • Acoustic cladding for the reduction of case-radiated noise
  • Secondary silencer Type TS for the reduction of air-regenerated noise
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General Information


  • VAV dual duct terminal unit for use in ventilation and air conditioning systems
  • Supply air control in dual-duct volume flow systems
  • Closed-loop volume flow control using an external power supply
  • For maximum acoustic and thermal comfort
  • Demand-based mixing of cold and warm air
  • Shut-off by means of switching (by others)

Special features

  • Integral effective pressure sensor with 3 mm measuring holes (resistant to dust and pollution)
  • Integral attenuator with at least 26 dB insertion loss at 250 Hz
  • Factory set-up or programming and aerodynamic function testing
  • Volume flow rate can later be measured and adjusted on site; additional adjustment device may be necessary
  • Inspection access according to VDI 6022

Nominal sizes

  • TVM-S: 125, 160, 200
  • TVM: 125, 160, 200, 250, 315, 400


  • TVM-S Dual duct unit, 60° spigot arrangement
  • TVM-S-D Dual duct unit with acoustic cladding, 60° spigot arrangement
  • TVM: Dual duct unit, 90° spigot arrangement
  • TVM-D: Dual duct unit with acoustic cladding, 90° spigot arrangement
  • Units with acoustic cladding and/or secondary silencer Type TS for very demanding acoustic requirements
  • Acoustic cladding cannot be retrofitted

Parts and characteristics

  • Ready-to-commission unit which consists of mechanical parts and control components
  • Averaging effective pressure sensors for volume flow rate measurement, one in the cold air flow and in the total air flow respectively
  • Damper blade
  • Integral attenuator
  • Inspection access
  • Factory-mounted control components complete with wiring and tubing
  • Aerodynamic functional testing on a special test rig before shipping of each unit
  • Set-up data is given on a label affixed to the unit
  • High control accuracy (even with upstream bend R = 1D)


  • Compact controller: Compact unit consisting of controller with potentiometers, effective pressure transducer and actuator


  • Double lip seals (factory-fitted)

Useful additions

  • Secondary silencer Type TS

Construction features

  • Rectangular casing
  • Spigot on the fan end suitable for circular ducts to EN 1506 or EN 13180
  • Spigot with groove for double lip seal
  • Connection on the room end suitable for ducts
  • Baffle plate is fitted after the damper blade for optimum aerodynamic performance
  • Position of the damper blade indicated externally at shaft extension
  • Thermal and acoustic insulation (lining)

Materials and surfaces

  • Casing and damper blade made of galvanised sheet steel
  • Damper blade seal made of TPE plastic
  • Lining is mineral wool
  • Effective pressure sensor made of aluminium
  • Plastic plain bearings
  • Shaft and linkage made of galvanised steel

Variant with acoustic cladding (-D)

  • Acoustic cladding made of galvanised sheet steel
  • Lining is mineral wool
  • Rubber elements for the insulation of structure-borne noise

Mineral wool

  • To EN 13501, fire rating class A1, non-combustible
  • RAL quality mark RAL-GZ 388
  • Non-hazardous to health thanks to being highly biosoluble in accordance with the Ordinance on Hazardous Substances and Note Q of the European Directive (EC) No. 1272/2008
  • Faced with glass fibre fabric as a protection against erosion from airflow velocities of up to 20 m/s
  • Inert to fungal and bacterial growth

Standards and guidelines

Fulfils the hygiene requirements of

  • EN 16798, Part 3
  • VDI 6022
  • DIN 1946, Part 4
  • Further standards, guidelines in accordance with hygiene certificate

Casing leakage

  • EN 1751, Class B

Closed blade leakage
Nominal sizes 125 and 160

  • EN 1751, Class 3
  • Fulfilment of the general requirements of DIN 1946, Part 4, with regard to the acceptable closed blade air leakage

Nominal sizes 200 to 400

  • EN 1751, Class 4
  • Fulfilment of the increased requirements of DIN 1946, Part 4, with regard to the acceptable closed blade air leakage


  • Maintenance-free as construction and materials are not subject to wear



Product Information




Operation Manuals