JZ-LL

Multileaf damper, variant JZ-LL-A2

Multileaf damper with actuator

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

Technical information

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

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
H	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
H	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 Δp_{t max} [Pa]

Construction	B
Construction	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 L_WA [dB(a)]

Δp_t[Pa]	Area B × H [m²]
Δp_t[Pa]	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

Die Schnellauslegung gibt einen guten Überblick über die zu erwartenden Schallleistungspegel und Druckdifferenzen. Ungefähre Zwischenwerte können interpoliert werden. Zu exakten Zwischenwerten und Spektraldaten führt die Auslegung mit unserem Auslegungsprogramm Easy Product Finder.

Die Schallleistungen L_WA gelten für Jalousieklappen mit einer Querschnittsfläche (B × H) von 1 m².

Die Druckdifferenzen gelten für Jalousieklappen, die in Luftleitungen eingebaut sind (Einbauart A).

JZ-LL, JZ-LL-A2, JZ-HL, Druckdifferenz und Schallleistungspegel

v [m/s]	Klappenstellung α
	AUF		20°		40°		60°		80°
	Δp_t [Pa]	L_WA [dB(A)]	Δp_t [Pa]	L_WA [dB(A)]	Δp_t [Pa]	L_WA [dB(A)]	Δp_t [Pa]	L_WA [dB(A)]	Δp_t [Pa]	L_WA [dB(A)]
0,5	<5	<30	<5	<30	<5	7.5	22	34	250	63
1	<5	<30	<5	<30	8	26	85	53	1000	83
2	<5	<30	<5	<30	30	46	345	73	>2000	>90
4	<5	41	10	44	120	65	1385	>90	>2000	>90
6	<5	52	24	56	270	77	>2000	>90	>2000	>90
8	10	60	42	64	480	85	>2000	>90	>2000	>90

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

q_v (m³/h)

Δp_t [Pa]

Air-regenerated noise

L_PA [dB(A)]

Life cycle assessment
A life cycle assessment is available for the product series in form of an Environmental Product Declaration (EPD) that has been checked and published by a programme holder.

JZ-LL

–

1000 × 1005

Z64

P1 - RAL 9010

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

Material	Galvanised steel
Duct connection	Flange holes on both sides
Bearings	Plastic bearings
Construction of blades	Standard
Operating side	Left
Nominal size	1200 × 675 mm
Installation subframe	With
Attachments	Spring return actuator, 20 Nm, 24 V AC/DC
Damper blade position	Power off to CLOSE
User interface	Standard construction

Variants

Multileaf damper, variant JZ-LL

Multileaf damper with explosion-proof actuator

Downloads

product information

Product data sheet JZ-LL

JZ-LL_PD_2024_02_12_DE_en Product data sheet 18 MB pdf

certificates

Certificate concerning statistical leakage tests

LC_v2_2024_10_DE_en Certificate 650 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--JZ-LL-AL--JZ-LL-A2-_HC_2020_06_05_DE_en Hygiene certificate 2,1 MB pdf
Declaration of incorporation Type JZ-LL

JZ-LL_CE_DoI_2023_12_01_DE_en Declaration of incorporation 660 KB pdf
EU declaration of conformity

CE_2020_06_JZ-Ex_DE_en Declaration of conformity 120 KB pdf
Environmental Product Declaration JZ-LL-A2

JZ-LL-A2_EPD_2024_03_DE_en Environmental Product Declarations 390 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

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JZ-LL

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

General information

Technical information

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

Variants

Downloads

product information

Product data sheet JZ-LL

certificates

Certificate concerning statistical leakage tests

Conformity Statement Type JZ-Ex

Declaration of hygiene conformity Type JZ-LL

Declaration of incorporation Type JZ-LL

EU declaration of conformity

Environmental Product Declaration JZ-LL-A2

Environmental product declaration JZ-LL

operation manuals

Installation manual JZ-* explosion-proof construction

Installation manual Serien JZ-x and WG-JZ

References

TECHNICALLY NECESSARY

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