กรกฎาคม 6, 2022
กรกฎาคม 6, 2022



Plastic circular VAV terminal units for aggressive extract air in laboratories and production facilities

  • Casing and damper blade made of flame-resistant polypropylene
  • Compact construction, only 400 mm long
  • High control accuracy even in case of unfavourable upstream conditions
  • Combination with fast-running actuators (air management systems)
  • Volume flow rate measurement with bluff body or nozzle
  • Slide-out sensor tubes allow for easy cleaning
  • Closed blade air leakage to EN 1751, class 4
  • Casing air leakage to EN 1751, class C

Optional equipment and accessories

  • With flanges on both ends
  • Plastic secondary silencer Type CAK for the reduction of air-regenerated noise
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General Information


  • Circular VAV terminal units for use in ventilation and air conditioning systems
  • Terminal unit made of plastic for controlling the volume flow rate of fume cupboards and fume hoods in labs
  • Suitable for contaminated air
  • Closed-loop volume flow control using an external power supply
  • For variable and constant volume flows
  • Shut-off by means of switching (equipment supplied by others)

Special features

  • High control accuracy even in case of unfavourable upstream conditions
  • Integral effective pressure sensor with 3 mm measuring holes (resistant to dust and pollution)
  • Construction with bluff body: Slide-out sensor tubes allow for easy inspection and cleaning
  • No metal parts come into contact with the airflow
  • Factory set-up or programming and aerodynamic function testing
  • Configuration and subsequent parameter setting for the control component can be done with the EasyConnect configuration software

Nominal sizes

  • Bluff body: 250 – 100, 250 – 160
  • Nozzle: 250 – D08, 250 – D10, 250 – D16
  • Bluff body available in 2 sizes and nozzle available in 3 sizes for various volume flow rate ranges


  • TVLK: VAV terminal unit
  • TVLK-FL: VAV terminal unit with flanges on both ends

Parts and characteristics

  • Ready-to-commission unit which consists of mechanical parts and control components (attachments)
  • Averaging effective pressure sensor for volume flow rate measurement,
    the construction with bluff body has a slide-out sensor that can be removed for cleaning
  • Damper blade
  • Factory assembled control components (attachments) 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


  • LABCONTROL: Control components (attachments) for air management systems


  • Matching flanges for both ends, including seals

Useful additions

  • Plastic secondary silencer Type CAK for demanding acoustic requirements

Construction features

  • Circular casing
  • Short casing: 392 mm without flange, 400 mm with flange
  • Spigot suitable for ducts according to DIN 8077
  • Both spigots with the same diameter (250 mm)
  • Position of the damper blade indicated externally at shaft extension

Materials and surfaces

  • Casing and damper blade made of flame-resistant polypropylene (PP), flammability to UL 94, V-0
  • Effective pressure sensor (bluff body or Venturi nozzle) and plain bearings made of polypropylene (PP)
  • Damper blade seal made of thermoplastic elastomers (TPE)

Standards and guidelines
Fulfils the hygiene requirements of

  • EN 16798, Part 3
  • VDI 6022, Sheet 1
  • DIN 1946, Part 4
  • For other applicable standards and guidelines refer to the hygiene certificate

Casing leakage

  • EN 1751, Class C

Closed blade air leakage

  • EN 1751, class 4
  • Meets 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
  • We recommend zero point correction once a year; alternatively you can use the EASYLAB control component with the EM-AUTOZERO expansion module for automatic zero point correction



Product Information




Operation Manuals