ARK_img_02psd.png
Non-return damper, variant ARK

Non-return damper with linkage

ARK_img_05psd.png
Adjustable restrictor

Adjustable restrictor

ARK_img_06psd.png
Linkage

Linkage

ARK_img_02psd.png
ARK_img_05psd.png
ARK_img_06psd.png

ARK 

FOR HEAVY-DUTY APPLICATIONS


Non-return dampers prevent unwanted airflows against the intended airflow direction when the system is not in operation

  • Air leakage with back pressure to EN 1751, class 4
  • Maximum differential pressure: 5000 Pa
  • Blades made of aluminium, casing made of galvanised steel
  • Available in standard sizes and many intermediate sizes
  • Variant ARK (with linked blades) for variable volume flows
  • Variant ARK-1 (with adjustable blade restrictors) for constant volume flows
  • Installation in horizontal or vertical ducts

 

Optional equipment and accessories

  • Installation subframe
  • Powder coating (RAL or DB)
  • Stainless steel construction with stainless steel casing; blades made of aluminium
  • Temperature resistant up to 200 °C with Viton seal

 

 

 


General information

Application
  • Non-return dampers for the fresh air and exhaust air ducts of ventilation and air conditioning systems
  • Prevention of unwanted airflows against the intended airflow direction when the system is not in operation
  • Blades close automatically when the system is shut down
  • Maximum differential pressure: 5000 Pa


Special features
  • Robust, maintenance-free construction
  • Maximum differential pressure: 5000 Pa
  • Closed blade air leakage with back pressure, in closing direction, to EN 1751, class 4
  • Damper for negative or positive pressure (air extract or discharge)
  • Operating temperature 0 to 80 °C
  • Optional temperature resistant construction for up to 200 °C, with Viton seal
  • Installation in horizontal or vertical ducts
  • Maintenance-free DU bearings with Teflon coating, bearing shafts made of stainless steel


Nominal sizes
  • B: 200, 400, 600, 800, 1000, 1200 mm (intermediate sizes: 201 – 1199 mm, in increments of 1 mm)
  • H: 345, 675, 1005, 1335, 1665, 1995 mm (intermediate sizes 355 – 505, 685 – 835, 1015 – 1165, 1345 – 1495, 1675 – 1825 mm in increments of 1 mm)
  • Any combination of B × H


Variants
  • ARK: Non-return damper with linked blades, preferably for variable volume flows
  • ARK-1: Non-return damper with adjustable blade restrictors, preferably for constant volume flows


Construction
  • Galvanised sheet steel, duct connection without flange holes
  • A2: Stainless steel
  • G: Duct connection with flange holes


Accessories
  • Installation subframe for the fast and simple installation of mechanical self-powered dampers


Standards and guidelines
  • Closed blade air leakage (against the intended airflow direction) to EN 1751, class 4
  • Casing air leakage to EN 1751, class C


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 blade air leakage

Description

Variants
  • ARK: Non-return damper with linked blades, preferably for variable volume flows
  • ARK-1: Non-return damper with adjustable blade restrictors, preferably for constant volume flows


Accessories
  • Installation subframe for the fast and simple installation of mechanical self-powered dampers


Standards and guidelines
  • Closed blade air leakage (against the intended airflow direction) to EN 1751, class 4
  • Casing air leakage to EN 1751, class C


Nominal sizes
  • B: 200, 400, 600, 800, 1000, 1200 mm (intermediate sizes: 201 – 1199 mm, in increments of 1 mm)
  • H: 345, 675, 1005, 1335, 1665, 1995 mm (intermediate sizes 355 – 505, 685 – 835, 1015 – 1165, 1345 – 1495, 1675 – 1825 mm in increments of 1 mm)
  • Any combination of B × H

Technical information

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

  • FUNCTION
  • TECHNICAL DATA
  • QUICK SIZING
  • SPECIFICATION TEXT
  • ORDER CODE
  • RELATED PRODUCTS

Non-return dampers open and close automatically. When the system is in operation, the blades open when air flows. The blade opening angle depends on the differential pressure and the volume flow rate; for variant ARK-1 the opening angle is limited by adjustable blade restrictors. When the system is shut down, the blades close due to their weight. They safely prevent air from flowing against the intended airflow direction.

 


Nominal sizes200 × 345 – 1200 × 1995 mm
Volume flow rate range690 – 23,950 l/s or 2484 – 86,220 m³/h at 10 m/s
Total differential pressure (horizontal airflow)115 Pa at 10 m/s
Total differential pressure (vertical airflow)45 Pa at 10 m/s
Maximum permissible differential pressure in closing direction5000 Pa
Operating temperature0 to 80 °C


ARK, free cross-sectional area [m²]

HB
20040060080010001200
3450.0430.0970.1520.2060.260.314
6750.0880.1980.3090.4190.5290.639
10050.1330.2990.4660.6320.7980.964
13350.1780.40.6220.8451.0671.289
16650.2230.5010.7791.0581.3361.614
19950.2680.6020.9361.2711.6051.94

Intermediate sizes: Interpolate values between widths.



Quick sizing tables provide a good overview of the volume flow rates with an airflow velocity of 10 m/s. Values for intermediate widths can be interpolated.

ARK, maximum volume flow rate

H

B

200

400

600

800

1000

1200

l/s

m³/h

l/s

m³/h

l/s

m³/h

l/s

m³/h

l/s

m³/h

l/s

m³/h

3456902484138049682070745227609936345012420414014904
6751350486027009720405014580540019440676024336810029160
10052010723640201447260402174480402894410050361801205043380
133526709612534019224802028872107003852013350480601600057600
16653330119886660239761000036000133004788016650599402000072000
19953990143647980287281195043020159505742019950718202395086220

 

Differential pressure Δpst [Pa]

v [m/s]Airflow
horizontalvertical
250135
475125
695105
811065
1011545

Specification text

Rectangular non-return dampers to prevent air from flowing against the intended airflow direction through fresh air and exhaust air ducts of air conditioning systems.
Ready-to-install component which consists of a casing, blades with low-friction bearings, and travel stop and sealing parts.


Special features
  • Robust, maintenance-free construction
  • Maximum differential pressure: 5000 Pa
  • Closed blade air leakage with back pressure, in closing direction, to EN 1751, class 4
  • Damper for negative or positive pressure (air extract or discharge)
  • Operating temperature 0 to 80 °C
  • Optional temperature resistant construction for up to 200 °C, with Viton seal
  • Installation in horizontal or vertical ducts
  • Maintenance-free DU bearings with Teflon coating, bearing shafts made of stainless steel


Construction
  • Galvanised sheet steel, duct connection without flange holes
  • A2: Stainless steel
  • G: Duct connection with flange holes


Technical data
  • Nominal sizes: 200 × 345 to 1200 × 1995 mm
  • Volume flow rate range: 690 – 23,950 l/s or 2484 – 86,220 m³/h at 10 m/s
  • Total differential pressure (horizontal airflow): 115 Pa at 10 m/s
  • Total differential pressure (vertical airflow): 45 Pa at 10 m/s
  • Maximum differential pressure in closing direction: 5000 Pa
  • Operating temperature: 0 to 80 °C
  • Maximum pressure: 5000 Pa


Sizing data
  • qᵥ [m³/h]
  • Δpst [Pa]

Air-regenerated noise
  • LWA [dB(A)]


ARK1A2G / 600 × 1005 / ER / P1 – RAL …
|||||||
1234567
1 Type
ARK Non-return damper
 
2 Blade mechanism
No entry required: linked blades
1 Blades with adjustable restrictors
 
3 Material
No entry required: galvanised steel, with aluminium blades
A2 Stainless steel with aluminium blades
 
4 Construction
No entry required: duct connection without flange holes
G Duct connection with flange holes
 
5 Nominal size [mm]
B × H
 
6 Installation subframe
No entry required: None
ER With (only for construction G)
 
7 Surface
No entry required: standard construction
P1 powder-coated, specify RAL CLASSIC colour
 
Gloss level
RAL 9010 50 %
RAL 9006 30 %
All other RAL colours 70 %


Order example: ARK–1–A2/1000×1995/P1–RAL 7001
Blade mechanismBlades with adjustable restrictors
MaterialStainless steel with aluminium blades
ConstructionWithout holes
Nominal size1000 × 1995 mm
Installation subframeWithout
User interfacePowder-coated, RAL 7001, silver

Variants, Product details, Installation

  • VARIANTS
  • DIMENSIONS
  • PRODUCT DETAILS
  • INSTALLATION

ARK

Variant 
  • Non-return damper with linked blades, preferably for variable volume flows 

Nominal sizes 
  • B: 200, 400, 600, 800, 1000, 1200 mm (intermediate sizes: 201 – 1199 mm, in increments of 1 mm) 
  • H: 345, 675, 1005, 1335, 1665, 1995 mm (intermediate sizes 355 – 505, 685 – 835, 1015 – 1165, 1345 – 1495, 1675 – 1825 mm in increments of 1 mm) 
  • Any combination of B × H 

Parts and characteristics
  • Ready-to-install non-return damper 
  • Blades with low-friction bearings 
  • Seal 
  • Travel stop (angle section) 
  • Linkage 

Construction features 
  • Rectangular casing, material thickness 2 mm 
  • Blades, material thickness 3 mm 
  • Flanges on both sides, suitable for duct connection, with or without flange holes 
  • Linkage for synchronous blade movement 
  • Blades with perimeter seal, pressed against travel stop (angle section) when closed 
  • Blade shafts with maintenance-free plastic bearings 

Materials and surfaces 
  • Casing and travel stop (angle section) made of galvanised sheet steel, material no. EN 10346-DX51D+Z140-200 
  • A2 construction: Casing and travel stop (angle section) made of stainless steel, material no. 1.4301 
  • Blades and linkage made of aluminium, material no. AlMg3 
  • Blade holders made of stainless steel, material no. 1.4301 
  • Blade shafts made of stainless steel, material no. 1.4104 
  • Plastic bearing made of PPS 
  • Neoprene seals 
  • P1: Powder-coated, RAL CLASSIC colour 
  • PS: Powder-coated, DB colour


ARK-1 

Variant 
  • Non-return damper with adjustable blade restrictors, preferably for constant volume flows 

Nominal sizes
  • B: 200, 400, 600, 800, 1000, 1200 mm (intermediate sizes: 201 – 1199 mm, in increments of 1 mm) 
  • H: 345, 675, 1005, 1335, 1665, 1995 mm (intermediate sizes 355 – 505, 685 – 835, 1015 – 1165, 1345 – 1495, 1675 – 1825 mm in increments of 1 mm) 
  • Any combination of B × H 

Parts and characteristics
  • Ready-to-install non-return damper 
  • Blades with low-friction bearings 
  • Seal 
  • Travel stop (angle section)
  • Two adjustable restrictors per blade 

Construction features
  • Rectangular casing, material thickness 2 mm 
  • Blades, material thickness 3 mm 
  • Flanges on both sides, suitable for duct connection, with or without flange holes 
  • Restrictors, adjustable from the outside, to limit the opening angle for each blade 
  • Blades can be moved independently of one another 
  • Blades with perimeter seal, pressed against travel stop (angle section) when closed 
  • Blade shafts with maintenance-free plastic bearings 

Materials and surfaces 
  • Casing and travel stop (angle section) made of galvanised sheet steel, material no. EN 10346-DX51D+Z140-200 
  • A2 construction: Casing and travel stop (angle section) made of stainless steel, material no. 1.4301 
  • Blades made of aluminium, material no. AlMg3 
  • Blade holders and restrictors made of stainless steel, material no. 1.4301 
  • Blade shafts made of stainless steel, material no. 1.4104 
  • Plastic bearing made of PPS 
  • Neoprene seals 
  • P1: Powder-coated, RAL CLASSIC colour 
  • PS: Powder-coated, DB colour
  • B: 200 – 1200 mm, intermediate sizes 201 – 1199 in increments of 1 mm
  • H: 345 – 1995 mm, intermediate sizes 355 – 505, 685 – 835, 1015 – 1165, 1345 – 1495,
  • 1675 – 1825 mm in increments of 1 mm
  • The weight for the next larger size applies


Flow cross section to calculate the airflow velocity
  • A = B × H

Unit of measure for B and H: m


ARK: Standard sizes, dimensions

H

No. of blades

No. of coupling rods

3451
67521
100531
133542
166552
199562

ARK: Intermediate sizes, dimensions

H

No. of blades

No. of coupling rods

Y

355 – 505

1

0

5 – 80

685 – 835

2

1

5 – 80

1015 – 1165

3

1

5 – 80

1345 – 1495

4

2

5 – 80

1675 – 1825

5

2

5 – 80


ARK-1: Standard sizes, dimensions

H

No. of blades

3451
6752
10053
13354
16655
19956

ARK-1: Intermediate sizes, dimensions

H

No. of blades

Y

355 – 50515 – 80
685 – 83525 – 80
1015 – 116535 – 80
1345 – 149545 – 80
1675 – 182555 – 80

ARK, ARK-1, weights [kg]

H

B

200

400

600

800

1000

1200

34581012151821
675121619232732
1005172226313641
1335222833394551
1665273440475461
1995324047556371
Flange holes, ARK ARK_gc_19ai.png

① Even number of holes (hole pitch = 250 mm)

② Uneven number of holes (hole pitch = 250 mm)

ARK, ARK-1, ARK2: width, no. of flange holes

H

Number of holes n

200 – 287 1
288 – 537 2
538 – 787 3
788 – 1037 4
1038 – 1200 5



ARK, ARK-1, ARK2: height, no. of flange holes

H

Number of holes n

345 – 461 2
462 – 711 3
712 – 961 4
962 – 1211 5
1212 – 1461 6
1462 – 1711 7
1712 – 1961 8
1962 – 1995 9



Installation and commissioning

ARK
  • Installation orientation: Horizontal airflow, any airflow direction; or vertical airflow with airflow from bottom to top
  • Only for installation in internal spaces


ARK-1
  • Installation orientation: Horizontal airflow, any airflow direction; or vertical airflow with airflow from bottom to top
  • Only for installation in internal spaces
  • Adjusting the restrictors to limit the opening angle for each blade

Downloads

product information

certificates

operation manuals

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