TYPE TVLK

OPTIMISED FOR USE IN LABORATORIES AND ON FUME CUPBOARDS

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

VAV terminal unit, variant TVLK, with nozzle and flange 00131763_0


  • Application
  • Description

Application

  • Circular LABCONTROL VAV terminal units of Type TVLK, made of plastic, to control the volume flow rate of fume cupboards and fume hoods
  • Suitable for contaminated air
  • Closed-loop volume flow control using an external power supply
  • Shut-off by means of switching (equipment supplied by others)

Special characteristics

  • High control accuracy even in case of unfavourable upstream conditions
  • Integral slide-out differential pressure sensor with 3 mm measuring holes (resistant to dust and pollution)
  • No metal parts come into contact with the airflow
  • Factory set-up or programming and aerodynamic function testing
  • Volume flow rate can be measured and subsequently adjusted on site; additional adjustment tool or configuration software may be necessary

Nominal sizes

  • Bluff body: 250 – 100, 250 – 160
  • Nozzle: 250 – D08, 250 – D10, 250 – D16
  • Bluff body available in two sizes and nozzle available in three sizes for different volume flow rate ranges

Variants

  • 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 differential pressure sensor for volume flow rate measurement; 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 prior to shipping of each unit
  • Unit carries test label with relevant data

Attachments

  • LABCONTROL: Control components (attachments) for air management systems
  • Universal controller: Controller, differential pressure transducer and actuators for special applications

Accessories

  • 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 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
  • Differential pressure sensor (with bluff body, or nozzle) and plain bearing made of polypropylene (PP)
  • Damper blade seal made of thermoplastic elastomers (TPE)

Standards and guidelines

  • Hygiene conforms to VDI 6022
  • Closed blade air leakage to EN 1751, class 4
  • Meets the increased requirements of DIN 1946, part 4, with regard to the acceptable closed blade air leakage
  • Casing air leakage to EN 1751, class C

Maintenance

  • Maintenance-free as construction and materials are not subject to wear
  • Zero point correction of the static differential pressure transducer should be carried out once per year (recommendation)

Technische Information

Function, Technical data, Quick sizing, Specification text, Order code, Related Products

  • Function
  • TECHNICAL DATA
  • QUICK SIZING
  • Specification text
  • Order code
  • RELATED PRODUCTS
Schematic illustration of the TVL 00137305_0
① Düse (optional)
② Anbaugruppe EASYLAB
③ Gehäuse
④ Stellantrieb
⑤ Staukörper und Sensorrohre


Functional description

For measuring the volume flow rate the VAV terminal unit is fitted either with a bluff body and a differential pressure sensor or with a nozzle.

The control components (attachments) include a differential pressure transducer that transforms the differential pressure (effective pressure) into an electric signal, a controller, and an actuator.

  • Fume cupboard control: The volume flow rate setpoint depends on the control strategy for the fume cupboard and is based on the face velocity, the sash position, or a constant value.
  • Volume flow control: The volume flow rate setpoint comes from an external unit.

The controller compares the actual value with the setpoint value and alters the control signal of the actuator if there is a difference between the two values.

Volume flow rate ranges

The minimum differential pressure of VAV terminal units is an important factor in designing the ductwork and in rating the fan including speed control.

Sufficient duct pressure must be ensured for all operating conditions and for all control units. The measurement points for fan speed control must be selected accordingly.

The volume flow rates given for VAV terminal units depend on the nominal size and on the control component (attachment) that is installed. The table gives the minimum and maximum values for a VAV terminal unit. Some control components may only have a limited volume flow rate range. This applies in particular to control components with a static differential pressure transducer. For volume flow rate ranges for all control components refer to our Easy Product Finder design programme.

TVLK with EASYLAB, volume flow rate ranges and minimum differential pressures

Nominal size
V
l/s
V
m³/h

∆pst min
Pa

∆pst min
Pa

∆pst min
Pa

∆pst min
Pa
∆V
± %
250-100 55 198 5 5 5 5 10
250-100 140 504 15 15 15 15 7
250-100 220 792 35 35 35 35 6
250-100 360 1296 85 85 85 90 5
250-160 30 108 5 5 5 5 10
250-160 80 288 25 25 25 25 7
250-160 120 432 50 50 50 50 6
250-160 195 702 130 130 130 130 5
250-D08 95 342 5 5 5 5 10
250-D08 210 756 10 10 10 10 7
250-D08 315 1134 20 20 20 20 6
250-D08 515 1854 45 50 55 55 5
250-D10 55 198 5 5 5 5 10
250-D10 140 504 10 10 10 10 7
250-D10 220 792 20 20 20 20 6
250-D10 360 1296 50 50 55 55 5
250-D16 30 108 5 5 5 5 10
250-D16 80 288 15 15 15 15 7
250-D16 120 432 30 30 30 30 6
250-D16 195 702 70 70 75 75 5

TVLK with Universal controller, volume flow rate ranges and minimum differential pressures

Nominal size
V
l/s
V
m³/h

∆pst min
Pa

∆pst min
Pa

∆pst min
Pa

∆pst min
Pa
∆V
± %
250-100 65 234 5 5 5 5 10
250-100 180 648 25 25 25 25 7
250-100 290 1044 55 55 55 60 6
250-100 360 1296 85 85 85 90 5
250-160 35 126 5 5 5 5 10
250-160 100 360 35 35 35 35 7
250-160 160 576 90 90 90 90 6
250-160 195 702 130 130 130 130 5
250-D08 95 342 5 5 5 5 10
250-D08 210 756 10 10 10 10 7
250-D08 315 1134 20 20 20 20 6
250-D08 515 1854 45 50 55 55 5
250-D10 65 234 5 5 5 5 10
250-D10 180 648 15 15 15 15 7
250-D10 290 1044 35 35 35 35 6
250-D10 360 1296 50 50 55 55 5
250-D16 35 126 5 5 5 5 10
250-D16 100 360 20 20 20 20 7
250-D16 160 576 50 50 50 50 6
250-D16 195 702 70 70 75 75 5


Nominal sizes

250 mm

Volume flow rate range

30 – 515 l/s or 108 – 1854 m³/h

Volume flow rate control range

Approx. 15 to 100% of the nominal volume flow rate

Minimum differential pressure

5 – 130 Pa

Maximum differential pressure

1000 Pa

Operating temperature

10 – 50 °C






Quick sizing tables provide a good overview of the room sound pressure levels that can be expected. Approximate intermediate values can be interpolated. Precise intermediate values and spectral data can be calculated with our Easy Product Finder design programme.

The first selection criteria for the nominal size are the actual volume flow rates Vmin and Vmax. The quick sizing tables are based on generally accepted attenuation levels. If the sound pressure level exceeds the required level, a larger air terminal unit and/or a silencer is required.

TVLK with EASYLAB, Sound pressure level at differential pressure 150 Pa

Nominal size V Air-regenerated noise Case-radiated noise
Nominal size V
Nominal size V LPA LPA1 LPA2
Nominal size l/s m³/h dB(A)

250-100

55

198

40

33

29

26

26

250-100

140

504

46

38

34

31

33

250-100

220

792

47

39

35

31

37

250-100

360

1296

48

39

35

32

42

250-160

30

108

37

32

28

25

22

250-160

80

288

41

35

31

28

29

250-160

120

432

43

37

33

30

32

250-160

195

702

49

42

38

35

40

250-D08

95

342

36

26

23

20

23

250-D08

210

756

40

31

27

24

29

250-D08

315

1134

41

32

29

26

33

250-D08

515

1854

44

34

31

28

38

250-D10

55

198

36

28

24

21

24

250-D10

140

504

42

34

30

27

31

250-D10

220

792

43

35

31

28

35

250-D10

360

1296

45

37

33

29

38

250-D16

30

108

33

28

24

22

21

250-D16

80

288

39

33

30

28

28

250-D16

120

432

42

36

33

30

31

250-D16

195

702

47

42

38

36

38

① TVLK

② TVLK with circular silencer CAK, insulation thickness 50 mm, length 500 mm

③ TVLK with circular silencer CAK, insulation thickness 50 mm, length 1000 mm

④ TVLK with circular silencer CAK, insulation thickness 50 mm, length 1500 mm


TVLK with VARYCONTROL Universal controller, Sound pressure level at differential pressure 150 Pa

Nominal size V Air-regenerated noise Case-radiated noise
Nominal size V
Nominal size V LPA LPA1 LPA2
Nominal size l/s m³/h dB(A)

250-100

65

234

41

34

30

27

27

250-100

180

648

46

38

34

31

35

250-100

290

1044

47

39

35

31

40

250-100

360

1296

48

39

35

32

42

250-160

35

126

38

33

29

26

23

250-160

100

360

42

36

32

29

30

250-160

160

576

45

37

34

31

34

250-160

195

702

49

42

38

35

40

250-D08

95

342

36

26

23

20

23

250-D08

210

756

40

31

27

24

29

250-D08

315

1134

41

32

29

26

33

250-D08

515

1854

44

34

31

28

38

250-D10

65

234

37

30

26

22

25

250-D10

180

648

43

35

31

28

33

250-D10

290

1044

44

36

32

29

36

250-D10

360

1296

45

37

33

29

38

250-D16

35

126

34

29

25

23

22

250-D16

100

360

41

35

32

29

30

250-D16

160

576

43

37

34

32

32

250-D16

195

702

47

42

38

36

38

① TVLK

② TVLK with circular silencer CAK, insulation thickness 50 mm, length 500 mm

③ TVLK with circular silencer CAK, insulation thickness 50 mm, length 1000 mm

④ TVLK with circular silencer CAK, insulation thickness 50 mm, length 1500 mm


Circular VAV terminal units made of flame-resistant plastic, for variable air volume systems and fume cupboards. Suitable for the control of extract air containing aggressive media since all components coming into contact with the airflow are made of plastic (no interior metal parts).

Ready-to-commission unit which consists of the mechanical parts and the electronic control components (attachments). Each unit contains an averaging differential pressure sensor with bluff body or a nozzle for volume flow rate measurement, and a damper blade. Factory assembled control components (attachments) complete with wiring and tubing.

Differential pressure sensor with 3 mm measuring holes (resistant to dust and pollution)

Spigot, suitable for ducts according to DIN 8077.

Position of the damper blade indicated externally at shaft extension.

Closed blade air leakage to EN 1751, class 4.

Casing air leakage to EN 1751, class C.

Special characteristics

  • High control accuracy even in case of unfavourable upstream conditions
  • Integral slide-out differential pressure sensor with 3 mm measuring holes (resistant to dust and pollution)
  • No metal parts come into contact with the airflow
  • Factory set-up or programming and aerodynamic function testing
  • Volume flow rate can be measured and subsequently adjusted on site; additional adjustment tool or configuration software may be necessary

Materials and surfaces

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

Technical data

  • Nominal sizes: 250 mm
  • Volume flow rate range: 30 to 515 l/s or 108 to 1854 m³/h
  • Volume flow rate control range: approx. 15 – 100 % of the nominal volume flow rate
  • Minimum differential pressure: 5 – 130 Pa
  • Maximum differential pressure: 1000 Pa

Attachments

Variable volume flow control with electronic EASYLAB controller for fume cupboards.

  • Supply voltage 24 V AC
  • Fast and stable control
  • Static differential pressure measurement
  • Fast-running actuator
  • Easy commissioning due to plug and play communication system
  • Controller is a modular system and can be expanded
  • Volume flow rate monitoring

Sizing data

  • V _______________________ [m³/h]
  • Δpst _______________________ [Pa]

Air-regenerated noise

  • LPA _______________________ [dB(A)]

Case-radiated noise

  • LPA _______________________ [dB(A)]

This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.

Order example: TVLK/250-D16/BPG/E2/150-650

Nominal size

250 with nozzle D16

Attachment

Universal controller with MP bus interface and static differential pressure transducer, fast-running actuator

Operating mode

Single

Operating values

150 – 650 m³/h


Order example: TVLK/250–100/ELAB/FH–VS/200–900 m³/h

Nominal size

250 with bluff body 100

Attachment

EASYLAB controller with fast-running actuator

Equipment function

Fume cupboard control with face velocity transducer

Volume flow rate

200 – 900 m³/h


Order example: TVLK/250-D08/ELAB/E2/400-1600

Nominal size

250 with nozzle D08

Attachment

EASYLAB controller TCU3 with fast-running actuator

External volume flow rate setting

Voltage signal 2 – 10 V DC

Operating values

400 – 1600 m³/h


 

Attachments
Type Universal, static
Type EASYLAB TCU3

Additional products
Type CAK

Variants, Attachments, Dimensions and weight

  • Variants
  • Attachments
  • Dimensions and weight

TVLK

  • VAV terminal unit for the control of variable air volume flow rates
  • Spigot to make connections to the ducting

TVLK-FL

  • VAV terminal unit for the control of variable air volume flow rates
  • With flanges to make detachable connections to the ductwork

TVLK, VARYCONTROL control components

Order code detail Controlled variable Controller Differential pressure transducer Actuator

Universal controller, static





BP3

Volume flow rate

Universal controller with MP bus interface TROX/Belimo

Static, integral

Actuator

BPG

Volume flow rate

Universal controller with MP bus interface TROX/Belimo

Static, integral

Fast-running actuator

BB3

Volume flow rate

Universal controller TROX/Belimo

Static, integral

Actuator


TVLK, LABCONTROL control components

Order code detail Controlled variable Controller Differential pressure transducer Actuator

EASYLAB





ELAB

Fume cupboard Room supply air Room extract air Room pressure Single controller

EASYLAB controller TCU3

Static, integral

Fast-running actuator


Attachments: VARYCONTROL control components

Controlled variable Interface Vmin -/ Vmax - adjustment Differential pressure transducer Actuator Manufacturer LVC TVR TVJ TVT TZ-S TA-S TVZ TVA TVM TVRK TVLK





















Easy controller


Dynamic















Easy

V



Integral

Integral







Compact controller


Dynamic















BC0

V

MP bus


Integral

Integral





BF0

V

MP bus


Integral

Integral












BL0

V

LonWorks


Integral

Integral






BM0

V

Modbus


Integral

Integral













BM0-J6

V

Modbus and plug-in connecting cable


Integral

Integral













XG0

V



Integral

Integral












XB0

V



Integral

Integral






LN0

V



Integral

Integral






LK0

V

KNX
















LY0

V



Integral

Integral














Compact controller


Static















SA0

V



Integral

Integral













SC0

Δp



Integral

Fast-running actuator, integral















Universal controller


Dynamic















B11

V



Integral

Actuator, torque for TVT












B13

V



Integral

Actuator







B27

V



Integral

Actuator












B1B

V



Integral

Spring return actuator






XC3

V



Integral

Spring return actuator








Universal controller


Static















BP1

V

MP bus


Separate part

Actuator, torque for TVT












BP3

V

MP bus


Separate part

Actuator





BPB

V

MP bus


Separate part

Spring return actuator





BPG

V

MP bus


Separate part

Fast-running actuator




BB1

V



Separate part

Actuator, torque for TVT












BB3

V



Separate part

Actuator





BBB

V



Separate part

Spring return actuator






XD1

V



Integral

Actuator





XD3

V



Integral

Spring return actuator





BR1

Δp

MP bus


100 Pa

Actuator, torque for TVT












BR3

Δp

MP bus


100 Pa

Actuator






BRB

Δp

MP bus


100 Pa

Spring return actuator





BRG

Δp

MP bus


100 Pa

Fast-running actuator







BS1

Δp

MP bus


600 Pa

Actuator, torque for TVT












BS3

Δp

MP bus


600 Pa

Actuator









BSB

Δp

MP bus


600 Pa

Spring return actuator









BSG

Δp

MP bus


600 Pa

Fast-running actuator









BG1

Δp



100 Pa

Actuator, torque for TVT












BG3

Δp



100 Pa

Actuator






BGB

Δp



100 Pa

Spring return actuator





BH1

Δp



600 Pa

Actuator, torque for TVT












BH3

Δp



600 Pa

Actuator










BHB

Δp



600 Pa

Spring return actuator









XE1

Δp



Integral, 100 Pa

Actuator





XE3

Δp



Integral, 100 Pa

Spring return actuator





XF1

Δp



Integral, 600 Pa

Actuator









XF3

Δp



Integral, 600 Pa

Spring return actuator









① TROX, ② TROX/Belimo, ③ TROX/Gruner, ④ Sauter, ⑤ Siemens

☒ order code detail, V volume flow rate, Δp differential pressure


Attachments: LABCONTROL control components

Controlled variable Interface Vmin -/ Vmax - adjustment Differential pressure transducer Actuator TVR TVJ TVT TZ-S TA-S TVZ TVA TVRK TVLK


















Easylab controller


Static












Elab

Room supply air

Room extract air

Room pressure

Single controller

TCU3


Integral

Fast-running actuator








Elab

Room supply air

Room pressure

Single controller

TCU3


Integral

Fast-running actuator









Elab

Room extract air

Room pressure

Single controller

TCU3


Integral

Fast-running actuator









Elab

Room supply air

Room extract air

Room pressure

Fume cupboard

Single controller

TCU3


Integral

Fast-running actuator











Electronic controller


Static












TMA

Room supply air

Room extract air

Room pressure


TCU-LON-II with LonWorks interface

Integral

Fast-running actuator








TMB

Fast-running actuator (brushless motor)








TMA

Room supply air

Room pressure


TCU-LON-II with LonWorks interface

Integral

Fast-running actuator









TMB

Fast-running actuator (brushless motor)









TMA

Room extract air

Room pressure


TCU-LON-II with LonWorks interface

Integral

Fast-running actuator









TMB

Fast-running actuator (brushless motor)









TMA

Room supply air

Room extract air

Room pressure

Fume cupboard


TCU-LON-II with LonWorks interface

Integral

Fast-running actuator









TMB

Fast-running actuator (brushless motor)










Nominal size
m
kg
250 5.1


Nominal size
m
kg
250 5.7




Installation details, Basic information and nomenclature

  • Installation details
  • Basic information and nomenclature

Installation and commissioning

  • Installation orientation must be as shown on the sticker

Upstream conditions

The volume flow rate accuracy ΔV applies to a straight upstream section of the duct. Bends, junctions or a narrowing or widening of the duct cause turbulence that may affect measurement. Duct connections, e.g. branches off the main duct, must comply with EN 1505. Some installation situations require straight duct sections upstream.

Space required for commissioning and maintenance

Sufficient space must be kept clear near any attachments to allow for commissioning and maintenance. It may be necessary to provide sufficiently sized inspection access openings.

Space requirement, control component on one side

Attachments
Attachments mm

VARYCONTROL




Universal controller

300

320

300


Space requirement, control components on two sides

Attachments
Attachments mm

LABCONTROL







EASYLAB

350

350

400

300

250

300


Space required for cleaning the sensor tubes

Nominal size
Nominal size mm

250-1** Bluff body

100

160

D

250-D** Nozzle

100

160

100

D: Casing diameter


Principal dimensions

ØD [mm]

VAV terminal units made of stainless steel: Outside diameter of the spigot

VAV terminal units made of plastic: Inside diameter of the connecting spigot

ØD₁ [mm]

Pitch circle diameter of flanges

ØD₂ [mm]

Outside diameter of flanges

ØD₄ [mm]

Inside diameter of the screw holes of flanges

L [mm]

Length of unit including connecting spigot

L₁ [mm]

Length of casing or acoustic cladding

B [mm]

Duct width

B₁ [mm]

Screw hole pitch of flange (horizontal)

B₂ [mm]

Outside dimension of flange (width)

B₃ [mm]

Width of device

H [mm]

Duct height

H₁ [mm]

Screw hole pitch of flange (vertical)

H₂ [mm]

Outside dimension of flange (height)

H₃ [mm]

Unit height

n [ ]

Number of flange screw holes

T [mm]

Flange thickness

m [kg]

Unit weight including the minimum required attachments (e.g. Compact controller)

Acoustic data

fm [Hz]

Octave band centre frequency

LPA [dB(A)]

A-weighted sound pressure level of air-regenerated noise of the VAV terminal unit, system attenuation taken into account

LPA1 [dB(A)]

A-weighted sound pressure level of air-regenerated noise of the VAV terminal unit with secondary silencer, system attenuation taken into account

LPA2 [dB(A)]

A-weighted sound pressure level of case-regenerated noise of the VAV terminal unit, system attenuation taken into account

LPA3 [dB(A)]

A-weighted sound pressure level of case-regenerated noise of the VAV terminal unit with acoustic cladding, system attenuation taken into account


All sound pressure levels are based on 20 μPa.

Volume flow rates

Vnom [m³/h] and [l/s]

Nominal volume flow rate (100 %)

  • The value depends on product type and nominal size
  • Values are published on the internet and in technical leaflets, and stored in the Easy Product Finder design software.
  • Reference value for calculating percentages (e.g. Vmax)
  • Upper limit of the setting range and maximum volume flow rate setpoint value for the VAV terminal unit

Vmin unit [m³/h] and [l/s]

Technically possible minimum volume flow rate

  • The value depends on product type, nominal size and control component (attachment)
  • Values are stored in the Easy Product Finder design software
  • Lower limit of the setting range and minimum volume flow rate setpoint value for the VAV terminal unit
  • Depending on the controller, setpoint values below Vmin unit (if Vmin equals zero) may result in unstable control or shut-off

Vmax [m³/h] and [l/s]

Upper limit of the operating range for the VAV terminal unit that can be set by customers

  • Vmax can only be smaller than or equal to Vnom
  • In case of analogue signalling to volume flow controllers (which are typically used), the set maximum value (Vmax) is allocated to the setpoint signal maximum (10 V) (see characteristic)

Vmin [m³/h] and [l/s]

Lower limit of the operating range for the VAV terminal unit that can be set by customers

  • Vmin should be smaller than or equal to Vmax
  • Do not set Vmin smaller than Vmin unit, otherwise the control may become unstable or the damper blade may close
  • Vmin may equal zero
  • In case of analogue signalling to volume flow controllers (which are typically used), the set minimum value (Vmin) is allocated to the setpoint signal minimum (0 or 2 V) (see characteristic)

V [m³/h] and [l/s]

Volume flow rate

ΔV [± %]

Volume flow rate tolerance from setpoint value

ΔVwarm [± %]

Volume flow rate tolerance for the warm air flow of dual duct terminal units

Differential pressure

Δpst [Pa]

Static differential pressure

Δpst min [Pa]

Static differential pressure, minimum

  • The static minimum differential pressure is equal to the pressure loss of the VAV terminal unit when the damper blade is open, caused by flow resistance (sensor tubes, damper mechanism)
  • If the pressure on the VAV terminal unit is too low, the setpoint volume flow rate may not be achieved, not even when the damper blade is open
  • Important factor in designing the ductwork and in rating the fan including speed control
  • Sufficient duct pressure must be ensured for all operating conditions and for all terminal units, and the measurement point or points for speed control must have been selected accordingly to achieve this

Construction

Galvanised sheet steel

  • Casing made of galvanised sheet steel
  • Parts in contact with the airflow as described for the product type
  • External parts, e.g. mounting brackets or covers, are usually made of galvanised sheet steel

Powder-coated surface (P1)

  • Casing made of galvanised sheet steel, powder-coated RAL 7001, silver grey
  • Parts in contact with the airflow are powder-coated or made of plastic
  • Due to production, some parts that come into contact with the airflow may be stainless steel or aluminium, powder-coated
  • External parts, e.g. mounting brackets or covers, are usually made of galvanised sheet steel

Stainless steel (A2)

  • Casing made of stainless steel 1.4201
  • Parts in contact with the airflow are powder-coated or made of stainless steel
  • External parts, e.g. mounting brackets or covers, are usually made of galvanised sheet steel

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