July 4, 2022
July 4, 2022



VAV terminal units for extract air control in buildings with variable air volume systems and demanding acoustic requirements

  • Highly effective integral attenuator
  • Box style construction for the reduction of the airflow velocity
  • Electronic control components for different applications (Easy, Compact, Universal, and LABCONTROL)
  • Closed blade air leakage to EN 1751, up to class 4
  • Casing air leakage to EN 1751, up to class C

Optional equipment and accessories

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




  • Rectangular VAV terminal units for use in ventilation and air conditioning systems
  • For control, inductor and shut-off tasks in the extract air area with high acoustic requirements
  • Integral attenuator
  • Closed-loop volume flow control using an external power supply
  • For variable or constant volume flow systems
  • Shut-off via override control by others
  • Can also be used for duct or room pressure control with suitable control components

Special features

  • Integral attenuator with at least 26 dB insertion loss at 250 Hz
  • Hygiene tested and certified
  • Factory set-up or programming and aerodynamic function testing
  • Setting and subsequent parameterisation on the control component possible, separate setting device may be required

Nominal sizes

125, 160, 200, 250, 315, 400


  • TVA: Extract air unit
  • TVA-D: Extract air unit with acoustic cladding
  • 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 sensor for volume flow rate measurement
  • Damper blade
  • Integral attenuator
  • Factory assembled control components complete with wiring and tubing
  • Aerodynamic functional testing on a special test rig prior to shipping of each unit
  • Set-up data is given on a label or volume flow rate scale affixed to the unit
  • High control accuracy even in case of unfavourable upstream conditions


  • EASY controller: Compact unit consisting of controller with potentiometers, effective pressure transducer and actuator
  • Compact controller: Compact unit consisting of controller with potentiometers, effective pressure transducer and actuator
  • Universal controllers: Controllers, differential pressure transducers and actuators for special applications
  • LABCONTROL: Control components for air management systems


  • Double lip seal (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 protection against erosion through 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, Sheet 1
  • DIN 1946, Part 4
  • Further standards, guidelines in accordance with hygiene certificate

Casing leakage: NS 125 – 200

  • EN 1751, Class C

NS 250 – 400

  • EN 1751, Class B

Closed blade air leakage:

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


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



Product Information




Operation Manuals