JZ-introduction-image
JZ_img_114462

Parallel blades

JZ_img_114458

Opposed blades

JZ-introduction-image
JZ_img_114462
JZ_img_114458

JZ 

For shutting off the airflow in air conditioning systems

Rectangular multileaf dampers for volume flow and pressure control as well as for shutting off ducts and openings in walls and ceiling slabs
■ Maximum dimensions 2000 × 1995 mm
■ Casing air leakage to EN 1751, class C
■ Aerofoil parallel or opposed action blades
■ Blades interconnected by external linkage (for parallel or opposed blade action)
■ Available in standard sizes and many intermediate sizes
■ Can be combined with external weather louvres

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
  • Multileaf dampers as a control element in the volume flow rate and differential pressure control in ventilation and air conditioning systems
  • For shutting off ducts and openings in walls and ceiling slabs
  • Parallel action blades are preferably used for opening/ closing
  • Due to their characteristics, opposed action blades are preferable for variable operation
  • Steel and stainless steel variants with brass or stainless steel bearings are suitable for use in potentially explosive atmospheres (ATEX)

Special characteristics
  • Aerofoil blades
  • Low-maintenance, robust construction
  • No parts with silicone
  • Available in standard sizes and many intermediate sizes

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

Construction
Duct connection
  • Corner holes on both sides
  • G: Flange holes on both sides
Bearings
  • Plastic bearings, operating temperature -20 – 100 °C
  • M: Brass bearings, operating temperature -20 – 150 °C
  • E: Stainless steel bearings, operating temperature -20 – 150 °C
Blades
Only for multileaf dampers made of galvanised sheet steel with brass or stainless steel bearing bushes (JZ-...-M, JZ-...-E)
  • V: Reinforced blades available 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 for the infinite adjustment of the multileaf dampers and for capturing the end positions
  • Open/close actuators for opening and closing multileaf dampers
  • Modulating actuators for variable damper blade positions
  • Pneumatic actuators for opening and closing multileaf dampers
  • Explosion-proof actuators for opening and closing multileaf dampers

Accessories
  • Installation subframes 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 connections, either corner holes or flange 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 ZS99)
  • With spindle as an attachment: For the position of the spindle, see "Dimensions and weights"
  • With actuator as an attachment: The actuator is always attached to the second blade from the top
  • Construction and the selection of materials comply with the criteria stipulated in EU 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 arms and external linkages made of galvanised steel or stainless steel
  • Plastic, brass or stainless steel bearings
  • P1: powder-coated, RAL CLASSIC colour
  • PS: powder-coated, DB colour

Standards and guidelines
  • Casing air leakage to EN 1751, class C

Maintenance
  • Maintenance-free, given that construction and the materials used are not subject to wear
  • Contamination should be removed as it may lead to corrosion and to increased air leakage in closed multileaf dampers

Technical information

  • Function
  • TECHNICAL DATA
  • SPECIFICATION TEXT
  • ORDER CODE
Schematic illustration of JZ-S
Schematic-illustration-of-JZ-S

① Casing
② Opposed blades
③ External linkage
④ Actuator
⑤ Transverse link

Schematic-illustration-of-JZ-S
Schematic-illustration-of-JZ-P
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 air leakage in closed multileaf dampers.


The torques for operating multileaf dampers must be dimensioned in such a way 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

-20 °C to 100 °C


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

H

B

200

400

600

800

1000

1200

1400

1600

1800

2000

180 – 1995

10

10

10

10

10

10

10

10

10

10


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

H

B

200

400

600

800

1000

1200

1400

1600

1800

2000

180

0.03

0.06

0.09

0.12

0.15

0.18

0.21

0.24

0.27

0.3

345

0.06

0.11

0.17

0.23

0.28

0.34

0.4

0.45

0.51

0.57

510

0.08

0.17

0.25

0.33

0.42

0.5

0.58

0.67

0.75

0.83

675

0.11

0.22

0.33

0.44

0.55

0.66

0.77

0.88

0.99

1.1

840

0.14

0.27

0.41

0.55

0.69

0.82

0.96

1.1

1.23

1.37

1005

0.16

0.33

0.49

0.66

0.82

0.98

1.15

1.31

1.47

1.64

1170

0.19

0.38

0.57

0.76

0.95

1.14

1.33

1.52

1.72

1.91

1335

0.22

0.43

0.65

0.87

1.09

1.3

1.52

1.74

1.96

2.17

1500

0.24

0.49

0.73

0.98

1.22

1.47

1.71

1.95

2.2

2.44

1665

0.27

0.54

0.81

1.08

1.36

1.63

1.9

2.17

2.44

2.71

1830

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 permitted differential pressure Δpmax t [Pa] in the case of closed multileaf damper

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)

3500

3000

2700

2500

2300

2100

2000


JZ-S, JZ-S-A2, sound power level LWA [dB (A)] in the case of closed multileaf damper

Δpt [Pa]

Area B × H [m²]

0.14

0.2

0.4

0.6

0.8

1.2

2

4

100

57

58

61

63

64

66

68

71

200

63

65

68

69

71

72

75

77

500

71

72

76

78

79

81

83

84

1000

78

80

82

84

85

88

90

>90

1500

81

83

86

88

89

>90

>90

>90

2000

84

85

89

>90

>90

>90

>90

>90


JZ-P, JZ-P-A2, sound power level LWA [Pa] in the case of closed multileaf damper

Δpt [Pa]

Area B × H [m²]

0.14

0.2

0.4

0.6

0.8

1.2

2

4

100

57

58

61

63

64

64

68

71

200

63

65

68

69

71

71

75

78

500

71

72

76

78

79

79

85

87

1000

78

80

82

84

85

85

89

>90


Δpt [Pa]

Area B × H [m²]

0.14

0.2

0.4

0.6

0.8

1.2

2

4

1500

81

82

86

88

89

89

>90

>90

2000

84

86

89

>90

90

>90

>90

>90

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 shutting off 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. 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

Material and surfaces
  • Casing and blades made of galvanised sheet steel or stainless steel
  • Blade shafts, drive arms and external linkages made of galvanised steel or stainless steel
  • Plastic, brass or stainless steel bearings
  • P1: powder-coated, RAL CLASSIC colour
  • PS: powder-coated, DB colour

Construction
Duct connection
  • Corner holes on both sides
  • G: Flange holes on both sides
Bearings
  • Plastic bearings, operating temperature -20 – 100 °C
  • M: Brass bearings, operating temperature -20 – 150 °C
  • E: Stainless steel bearings, operating temperature -20 – 150 °C
Blades
Only for multileaf dampers made of galvanised sheet steel with brass or stainless steel bearing bushes (JZ-...-M, JZ-...-E)
  • V: Reinforced blades available from width 800 mm

Technical data
  • Nominal sizes: 200 × 180 mm – 2000 × 1995 mm
  • Operating temperature: -20 to 100 °C

Sizing data
  • qv (m³/h)
  • Δpt [Pa]
Air-regenerated noise
  • LPA [dB(A)]
JZ–P–A2–G–M––L/1000 × 1005/ER/Z64/NC/P1 - RAL 9010
||||||||||||
123456789101112

1 Type
JZ Multileaf damper


2 Function
S Opposed (standard)
P Parallel


3 Material
No entry: galvanised steel
A2 Stainless steel


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


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


6 Construction of blades
Only for galvanised multileaf dampers with brass or stainless
steel bearing bushes
V Reinforced blades, available from width 800 mm


7 Operating side
No entry: right
L left


8 Nominal size [mm]
Specify size width × height

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


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


10 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


11 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)


12 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–S–G–M–V–L/800×510/ER/Z43

FunctionOpposed
MaterialGalvanised steel
Duct connectionFlange holes on both sides
BearingsBrass bearings
Construction of bladesReinforced blades
Operating sideLeft
Nominal size800 × 510 mm
Installation subframeWith
AttachmentsActuator, 10 Nm, 230 V AC, 3-point
User interfaceStandard construction

Downloads

product information

  • Product data sheet JZ

    JZ_PD_2026_04_02_DE_en Product data sheet 900 KB pdf

  • Product overview Type JZ

    PO/2013-11/JZ/DE/de Product overview 38 KB pdf

certificates

  • Certificate concerning statistical leakage tests

    LC_v2_2024_10_DE_en Certificate  650 KB pdf

  • Certificate concerning statistical leakage tests

    LC_v1_2024_10_DE_en Certificate  660 KB pdf

  • Declaration of conformity or declaration of incorporation Type JZ

    CE/JZ/DE/en Declaration of conformity or declaration of incorporation 69 KB pdf

  • Declaration of hygiene conformity Type JZ

    JZ_HC_2025_10_en Declaration of hygiene conformity 1,2 MB pdf

  • Declaration of hygiene conformity Type JZ-Ex Declaration of conformity

    HC/JZ-Ex/DE/de Declaration of hygiene conformity 710 KB pdf

  • Declaration of incorporation Type JZ

    JZ_CE_DoI_2023_12_01_DE_en Declaration of incorporation 660 KB 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

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