JZ-LL-picture
JZ-LL_img_426189

Opposed blades

JZ-LL-picture
JZ-LL_img_426189

JZ-LL  

For extremely low-leakage shut-off in ventilation and air conditioning systems

Rectangular multileaf dampers for volume flow and pressure control as well as for extremely low-leakage shut-off of ducts and openings in walls and ceiling slabs
■ Maximum dimensions 2000 × 1995 mm
■ Closed multileaf damper air leakage to EN 1751, classes 3 – 4, depending on size
■ Casing air leakage to EN 1751, class C
■ Aerofoil opposed action blades
■ Closed cell side seals meet increased hygiene requirements
■ Blades interconnected by external linkage
■ Available in standard sizes and many intermediate sizes

Optional equipment and accessories
■ Actuators: Open/close actuators, modulating actuators
■ Explosion-proof construction with pneumatic actuator or spring return actuator
■ Powder-coated construction

General information

Application
  • Stainless steel and powder-coated construction

Special characteristics
  • Aerofoil blades
  • Low-maintenance, robust construction
  • No parts with silicone
  • Available in standard sizes and many intermediate sizes
  • Closed cell side seals meet increased hygiene requirements

Classification

  • Closed blade air leakage to EN 1751
Test pressure up to 2000 Pa
  • Up to B = 599 mm, class 3
  • B = 600 – 1000 mm, class 4
Test pressure up to 1000 Pa
  • Up to B = 599 mm, class 3
  • B = 600 – 2000 mm, class 4

Nominal sizes
  • B: 200 – 2000 mm, in increments of 1 mm
  • Width subdivided (BM): 2001 – 4150 mm, in increments of 1 mm
  • H: 180, 345, 510, 675, 840, 1005, 1170, 1335, 1500, 1665, 1830, 1995 mm (intermediate sizes 183 – 1995 in increments of 1 mm, except for standard size H - 1 mm, H + 1 mm, H + 2 mm)
  • Height subdivided (HM): 1999 – 4066 mm, in increments of 1 mm
  • Any combination of B × H

Variants

  • JZ-LL: Multileaf damper with opposed blade action, made of galvanised sheet steel
  • JZ-LL-A2: Multileaf damper with opposed blade action, made of stainless steel

Constructions
  • Duct connection
  • Corner holes on both sides
  • G: Flange holes on both sides
Bearings
  • Plastic bearings, operating temperature 0 – 100 °C
  • M: Brass bearings, operating temperature 0 – 100 °C
  • E: Stainless steel bearings, operating temperature 0 – 100 °C
Blades
  • Only for steel multileaf dampers with brass or stainless steel bearings (JZ-...-M, JZ-...-E)
  • V: Reinforced blades available as from width 800 mm

Parts and characteristics
  • Ready-to-install shut-off damper
  • Blades with external linkage
  • Drive arm

Attachments
  • Quadrant stays and limit switches: Quadrant stays to adjust the damper blades (infinite adjustment) and for capturing the end positions
  • Open/close actuators: Actuators for opening and closing multileaf dampers
  • Modulating actuators: Actuators for infinite blade blade adjustment
  • Pneumatic actuators: Pneumatic actuators for opening and closing multileaf dampers
  • Explosion-proof actuators: Actuators for opening and closing multileaf dampers installed in potentially explosive atmospheres

Accessories

  • Installation subframe: Installation subframe for the fast and simple installation of multileaf dampers

Construction features
  • Rectangular casing, welded (P1: casing with screws), material thickness galvanised steel 1.25 mm, stainless steel A2 = 1.2 mm
  • Blades, material thickness 1 mm
  • Flanges on both sides, suitable for duct connection, either flange holes or corner holes
  • External linkage, robust and durable, consisting of the coupling rod and horizontal arms
  • Damper blade shafts, Ø12 mm, with notch to indicate the damper blade position (not for attachment ZS99)
  • With drive shaft as an attachment: For the position of the drive shaft see 'Dimensions and weight'
  • With actuator as an attachment: The actuator is always attached to the second blade from the top
  • Travel stop (angle section) ensures tight closure of the top and bottom blades
  • Blade tip seals and side seals
  • The construction and selection of materials comply with the criteria stipulated in European directives, referred to as ATEX (for use in potentially explosive atmospheres) for variants with brass or stainless steel bearings (-M, -E)

Material and surfaces
  • Casing and blades made of galvanised sheet steel or stainless steel
  • Blade shafts, drive arm and external linkage made of galvanised steel or stainless steel
  • Plastic, brass or stainless steel bearings
  • Blade tip seals made of PP/PTV plastic
  • Side seals made of closed cell PE foam
  • P1: Powder-coated, RAL CLASSIC colour
  • PS: Powder-coated, DB colour


Standards and guidelines

  • Casing air leakage to EN 1751, class C
  • Meets the general requirements of DIN 1946, Part 4, with regard to the acceptable closed multileaf damper air leakage
  • Multileaf damper sizes from B = 600 mm meet the increased requirements of DIN 1946, Part 4, with regard to the maximum closed multileaf damper air leakage

Maintenance

  • Maintenance-free as construction and materials are not subject to wear
  • Contamination should be removed as it may lead to corrosion and to increased closed multileaf damper air leakage

Disclosure of Chemicals
  • RoHS EU Directive 2011/65/EU (RoHS)
    • This product or single variants comply with EU Directive 2011/65/EU (RoHS) on the restriction of the use of certain hazardous substances in electrical and electronic equipment. For more information, please refer to our Environmental Product Declarations.
  • REACH 1907/2006 (EC Regulation REACH)
    • This product or single variants comply with the provisions of EC Regulation No. 1907/2006, also known as REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals). For more information, please refer to our Environmental Product Declarations.

Technical information

  • Function
  • TECHNICAL DATA
  • SPECIFICATION TEXT
  • ORDER CODE
Schematic illustration of JZ-LL, JZ-LL-A2 Schematic-illustration-of-JZ-LL--JZ-LL-A2

① Casing
② Slide disc
③ Opposed blades
④ Side seal
⑤ Blade tip seal
⑥ Travel stop (angle section with seal)
⑦ Actuator
⑧ Transverse link
⑨ External linkage

Multileaf dampers with external linkage can have parallel action blades or opposed action blades. An external linkage transfers the synchronous rotational movement from the drive arm to the individual blades. Even very large multileaf dampers can be safely opened and closed with this type of linkage. Opposed action blades close at various speeds as the linkage includes a transverse link. This facilitates the closing process and reduces the closed multileaf damper air leakage.

The torque for actuating multileaf dampers must be dimensioned so that the damper can be safely opened and closed. For closure, the torque must suffice to ensure complete shut-off by the blades.
Opening is initiated without the impact of aerodynamic forces.
When air flows through the damper, the aerodynamic forces of the airflow create a closing force (torque) on the blades; this happens independently of the direction of the airflow. This closing force must be countered, or overcome. The blade angle α with the largest torque depends, among other things, on the fan characteristics.


Nominal sizes

200 × 180 – 2000 × 1995 mm

Operating temperature

0 – 100 °C


JZ-LL, JZ-LL-A2, minimum torques [Nm]

H

B

200

400

600

800

1000

1200

1400

1600

1800

2000

180

10

10

10

10

10

10

10

10

10

10

345

10

10

10

10

10

10

10

10

10

10

510

10

10

10

10

10

10

10

10

10

10

675

10

10

10

10

10

10

15

15

15

15

840

10

10

10

10

15

15

15

15

15

15

1005

10

10

15

15

15

15

15

15

20

20

1170

15

15

15

15

15

15

20

20

30

30

1335

15

15

15

15

20

20

30

30

30

30

1500

15

15

15

20

20

30

30

30

30

30

1665

20

20

20

20

30

30

30

30

30

30

1830

20

20

20

20

30

30

30

30

30

30

1995

20

20

20

20

30

30

30

30

30

30


Steel and stainless steel multileaf dampers, free cross-sectional area [m2]

H

B

200

400

600

800

1000

1200

1400

1600

1800

2000

180 – 344

0.03

0.06

0.09

0.12

0.15

0.18

0.21

0.24

0.27

0.3

345 – 509

0.06

0.11

0.17

0.23

0.28

0.34

0.4

0.45

0.51

0.57

510 – 674

0.08

0.17

0.25

0.33

0.42

0.5

0.58

0.67

0.75

0.83

675 – 839

0.11

0.22

0.33

0.44

0.55

0.66

0.77

0.88

0.99

1.1

840 – 1004

0.14

0.27

0.41

0.55

0.69

0.82

0.96

1.1

1.23

1.37

1005 – 1169

0.16

0.33

0.49

0.66

0.82

0.98

1.15

1.31

1.47

1.64

1170 – 1334

0.19

0.38

0.57

0.76

0.95

1.14

1.33

1.52

1.72

1.91

1335 – 1499

0.22

0.43

0.65

0.87

1.09

1.3

1.52

1.74

1.96

2.17

1500 – 1664

0.24

0.49

0.73

0.98

1.22

1.47

1.71

1.95

2.2

2.44

1665 – 1829

0.27

0.54

0.81

1.08

1.36

1.63

1.9

2.17

2.44

2.71

1830 – 1994

0.3

0.6

0.89

1.19

1.49

1.79

2.08

2.38

2.68

2.98

1995

0.32

0.65

0.97

1.3

1.62

1.95

2.27

2.6

2.92

3.25

Intermediate sizes: Interpolate values between widths.


Maximum static differential pressure for a closed multileaf damper Δpt max [Pa]

Construction

B

800

1000

1200

1400

1600

1800

2000

Standard

construction

2500

2000

1650

1400

1250

1100

1000

Brass bearings (-M)

3000

2500

2200

1950

1750

1600

1500

Stainless steel

bearings (-E)

3000

2500

2200

1950

1750

1600

1500

Reinforced blades (-

M-V, -E-V) 3

3500

3000

2700

2500

2300

2100

2000


JZ-LL, JZ-LL-A2, sound power level for a closed multileaf damper LWA [dB(a)]

Δpt [Pa]

Area B × H [m²]

0.14

0.2

0.4

0.6

0.8

1.2

2

4

100

<35

35

38

39

41

42

45

48

200

41

42

45

47

48

50

53

56

500

51

52

55

57

58

60

62

65

1000

58

60

63

64

66

68

70

>70

1500

63

64

67

69

>70

>70

>70

>70

2000

65

67

70

>70

>70

>70

>70

>70

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

Rectangular multileaf dampers for volume flow and pressure control as well as for low-leakage shut-off of ducts and openings in walls and ceiling slabs. Ready-to-operate unit which consists of the casing, aerofoil blades and the blade mechanism. Flanges on both sides, suitable for duct connection. The blade position is indicated externally by a notch in the blade shaft extension.

Closed multileaf damper air leakage to EN 1751, class 4 (B ≤ 600 mm, class 3)
Casing air leakage to EN 1751, class C

Special characteristics

  • Aerofoil blades
  • Low-maintenance, robust construction
  • No parts with silicone
  • Available in standard sizes and many intermediate sizes
  • Closed cell side seals meet increased hygiene requirements

Material and surfaces

  • Casing and blades made of galvanised sheet steel or stainless steel
  • Blade shafts, drive arm and external linkage made of galvanised steel or stainless steel
  • Plastic, brass or stainless steel bearings
  • Blade tip seals made of PP/PTV plastic
  • Side seals made of closed cell PE foam
  • P1: Powder-coated, RAL CLASSIC colour
  • PS: Powder-coated, DB colour

Constructions

  • Duct connection
  • Corner holes on both sides
  • G: Flange holes on both sides
Bearings
  • Plastic bearings, operating temperature 0 – 100 °C
  • M: Brass bearings, operating temperature 0 – 100 °C
  • E: Stainless steel bearings, operating temperature 0 – 100 °C
Blades
  • Only for steel multileaf dampers with brass or stainless steel bearings (JZ-...-M, JZ-...-E)
  • V: Reinforced blades available as from width 800 mm

Technical data

  • Nominal sizes: 200 × 180 mm – 2000 × 1995 mm
  • Operating temperature: 0 to 100 °C

Sizing data

  • qv (m³/h)
  • Δpt [Pa]
  • Air-regenerated noise
  • LPA [dB(A)]

Life cycle assessment

A life cycle assessment is available for the product type in the form of an environmental product declaration (EPD), which has been checked and published by a programme holder.
JZ-LL–A2–G–M––L/1000 × 1005/ER/Z64/NC/P1 - RAL 9010
|||||||||||
1234567891011

1 Type
JZ-LL Low-leakage multileaf damper, closed blade air leakage to EN 1751, classes 3 – 4

2 Material
No entry: galvanised steel
A2 Stainless steel

3 Duct connection
No entry: corner holes on both sides,
G Flange holes on both sides (no corner holes)

4 Bearings
No entry: plastic bearings
M Brass bearings
E Stainless steel bearings

5 Construction of blades
Only for steel or stainless steel multileaf dampers with brass or stainless steel bearings
V Reinforced blades, available from width 800 mm

6 Operating side
No entry: right
L left

7 Nominal size [mm]
Specify width × height

Galvanised steel variants are available with the width or height subdivided
Width > 2000: width subdivided
Height > 1995: height subdivided

8 Installation subframe
No entry: without installation subframe
ER With installation subframe (duct connection G only)

9 Attachments
No entry: without attachments
Z04 – Z07 Hold open device
Z12 – Z51 Actuators
ZF01 – ZF15 Spring return actuators
Z60 – Z77 Pneumatic actuators

Explosion-proof actuators
Z1EX, Z3EX Electrical
Z60EX – Z77EX Pneumatic

10 Damper blade safety function
Only with spring return actuators or pneumatic actuators
NO pressure off/power off to OPEN (Normally Open)
NC pressure off/power off to CLOSE (Normally Closed)

11 Surface
No entry: standard construction
P1 powder-coated, specify RAL CLASSIC colour

Gloss level
RAL 9010 GU 50
RAL 9006 GU 30
All other RAL colours GU 70

Order example: JZ-LL–G–L/1200×675/ER/ZF06/NC

MaterialGalvanised steel
Duct connectionFlange holes on both sides
BearingsPlastic bearings
Construction of bladesStandard
Operating sideLeft
Nominal size1200 × 675 mm
Installation subframeWith
AttachmentsSpring return actuator, 20 Nm, 24 V AC/DC
Damper blade positionPower off to CLOSE
User interfaceStandard construction

Downloads

product information

  • Product data sheet JZ-LL

    JZ-LL_PD_2026_07_15_DE_en Product data sheet 650 KB pdf

certificates

  • Certificate concerning statistical leakage tests

    LC_v2_2024_10_DE_en Certificate  650 KB pdf

  • Conformity Statement Type JZ-Ex

    JZ-Ex_ATEX_2023_11_DE_en Conformity Statement 720 KB pdf

  • Conformity Statement Type JZ-Ex

    JZ-x_WG-JZ Installation manual  Conformity Statement 720 KB pdf

  • Declaration of hygiene conformity Type JZ-LL

    JZ-LL_HC_2025_10_en Declaration of hygiene conformity 1,2 MB pdf

  • Declaration of incorporation Type JZ-LL

    JZ-LL_CE_DoI_2026_07_CH_en Declaration of incorporation 1,1 MB pdf

  • EU declaration of conformity

    CE_2020_06_JZ-Ex_DE_en Declaration of conformity 120 KB pdf

  • Environmental product declaration JZ-LL

    JZ-LL_EPD_2024_11_DE_en Environmental product declaration 1,1 MB pdf

operation manuals

  • Installation manual JZ-* explosion-proof construction

    JZ-x-Ex_IM_A00000048935_V5_2023_11_GB_en Installation manual 1,1 MB pdf

  • Installation manual Serien JZ-x and WG-JZ 

    JZ-x_WG-JZ_IM_A00000044990_V6_2023_11_GB_en Installation manual 1,5 MB pdf

References

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Tel.: +32(0)2 522 07 80 | E-mail: info@trox.be

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Thank you for your message!

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