Type UL

For installation into walls or rectangular ducts

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

  • Maximum differential pressure: 100 Pa
  • Angle section border to be installed in wall openings
  • Available in standard sizes and many intermediate sizes
  • Non-return damper with formed aluminium blades for normal requirements; blades are fitted with seals for sound attenuation


Optional equipment and accessories

  • Installation subframe
  • Powder coating (RAL or DB)

Non-return damper, variant UL-1 00136531_0


  • Application
  • Description

Application

  • Type UL non-return dampers for installation into internal walls and rectangular ducts
  • 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: 100 Pa

Special characteristics

  • Any intermediate sizes within the standard size range are available
  • operating temperature: –20 – 80 °C
  • Maximum differential pressure: 100 Pa
  • Non-return dampers are opened and closed by the airflow; no actuator is required
  • Non-return damper with formed aluminium blades for normal requirements; blades are fitted with seals for sound attenuation

Nominal sizes

  • B: 200, 400, 600, 800, 1000, 1200, 1400, 1600 mm (intermediate sizes: 201 – 1599 mm in increments of 1 mm)
  • H: 215, 315, 415, 515, 615, 715, 815, 1015, 1215, 1415, 1615 mm (intermediate sizes: 216 – 1614 mm, in increments of 1 mm)
  • Any combination of B × H

Variants

  • UL-1: Non-return damper for airflows directed towards the installation side
  • UL-2: Non-return damper for airflows directed towards the rear side (suction)

Parts and characteristics

  • Border
  • Blades with low-friction bearings
  • Blade restrictors
  • Blade tip seals
  • Bottom travel stop (angle section)
  • Visible mullion from B = 997 mm

Accessories

  • Installation subframe: Installation subframe for the fast and simple installation of mechanically self-powered dampers

Construction features

  • Border, material thickness 1.75 mm
  • Blades, material thickness 1.0 mm
  • Additional side bar with fixing holes to accommodate the blade shafts and integral blade restrictors (pins)
  • Blade restrictors prevent the blades from opening beyond a certain angle
  • Border fixing holes

Materials and surfaces

  • Border, mullion and travel stop (angle section) made of galvanised sheet steel
  • Blades made of formed aluminium
  • Blade shafts made of brass
  • Side bar made of PVC plastic
  • Blade tip seals made of foamed polyester
  • Blade restrictors made of plastic
  • P1: Powder-coated, RAL CLASSIC colour
  • PS: Powder-coated, DB colour

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

Technical information

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

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

Functional description

Non-return dampers open and close automatically.

When the system is in operation, the blades open when air flows.

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 sizes

200 × 215 to 1600 × 1615 mm

Volume flow rate range

110 – 6460 l/s or 396 – 23256 m³/h at 2.5 m/s

Total differential pressure

25 Pa at 2.5 m/s

Maximum differential pressure in closing direction

100 Pa

Operating temperature

–20 to 80 °C


Quick sizing tables provide a good overview of the volume flow rates with an airflow velocity of 2.5 m/s. Intermediate values can be interpolated.

Sizing example

Given data

V =2000 l/s (7200 m³/h)

v = 2.5 m/s

Fresh air

Maximum width: 1000 mm

Quick sizing

UL-2/1000×815

Calculation procedure

A = 1.000 × 0.815 = 0.815 m²

v = V ∕ A = 2000 ∕ 0.815 ( ∕ 1000) = 2.5 m/s

Δpt = 30 Pa

UL, KUL: Width 200 – 600 mm, volume flow rate at 2.5 m/s

H B [mm]
H 200 300 400 500 600
mm l/s m³/h l/s m³/h l/s m³/h l/s m³/h l/s m³/h

215

110

396

160

576

215

774

270

972

325

1170

315

160

576

235

846

315

1134

395

1422

475

1710

415

210

756

310

1116

415

1494

520

1872

625

2250

515

260

936

385

1386

515

1854

645

2322

775

2790

615

310

1116

460

1656

615

2214

770

2772

925

3330

715

360

1296

535

1926

715

2574

895

3222

1070

3852

815

410

1476

610

2196

815

2934

1020

3672

1220

4392

1015

510

1836

760

2736

1020

3672

1270

4572

1520

5472

1215

610

2196

910

3276

1220

4392

1520

5472

1820

6552

1415

710

2556

1060

3816

1420

5112

1770

6372

2120

7632

1615

810

2916

1210

4356

1620

5832

2020

7272

2420

8712


UL, KUL: Width 800 – 1600 mm, volume flow rate at 2.5 m/s

H B [mm]
H 800 1000 1200 1400 1600
mm l/s m³/h l/s m³/h l/s m³/h l/s m³/h l/s m³/h

215

430

1548

540

1944

645

2322

755

2718

860

3096

315

630

2268

790

2844

945

3402

1100

3960

1260

4536

415

830

2988

1040

3744

1250

4500

1450

5220

1660

5976

515

1030

3708

1290

4644

1550

5580

1800

6480

2060

7416

615

1230

4428

1540

5544

1850

6660

2150

7740

2460

8856

715

1430

5148

1790

6444

2150

7740

2500

9000

2860

10296

815

1630

5868

2040

7344

2450

8820

2850

10260

3260

11736

1015

2030

7308

2540

9144

3050

10980

3550

12780

4060

14616

1215

2430

8748

3040

10944

3650

13140

4250

15300

4860

17496

1415

2830

10188

3540

12744

4250

15300

4950

17820

5660

20376

1615

3230

11628

4040

14544

4850

17460

5650

20340

6460

23256


Differential pressure

v UL-1 UL-2
v Δpt
m/s Pa

0.5

10

12

1

16

18

2

20

24

3

25

30

4

30

40

5

40

55

6

45

65


Rectangular non-return dampers to prevent air from flowing against the intended airflow direction; for installation into internal walls and into rectangular ducts.

Ready-to-install component which consists of a border, blades with low-friction bearings, and travel stop and sealing parts.

Special characteristics

  • Any intermediate sizes within the standard size range are available
  • operating temperature: –20 – 80 °C
  • Maximum differential pressure: 100 Pa
  • Non-return dampers are opened and closed by the airflow; no actuator is required
  • Non-return damper with formed aluminium blades for normal requirements; blades are fitted with seals for sound attenuation

Materials and surfaces

  • Border, mullion and travel stop (angle section) made of galvanised sheet steel
  • Blades made of formed aluminium
  • Blade shafts made of brass
  • Side bar made of PVC plastic
  • Blade tip seals made of foamed polyester
  • Blade restrictors made of plastic
  • P1: Powder-coated, RAL CLASSIC colour
  • PS: Powder-coated, DB colour

Technical data

  • Nominal sizes: 200 × 215 to 1600 × 1615 mm
  • Volume flow rate range: 110 – 6460 l/s or 396 – 23256 m³/h at 2.5 m/s
  • Total differential pressure: 25 Pa at 2.5 m/s
  • Maximum differential pressure in closing direction: 100 Pa
  • Operating temperature: –20 to 80 °C

Sizing data

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

Air-regenerated noise

  • LWA __________________ [dB(A)]

Order example: UL–2/600×1615/ER

Direction of airflow

Towards the rear

Nominal size

600 × 1615 mm

Installation subframe

With

Surface

Standard construction


 

Dimensions and weight, Product details

  • Dimensions and weight
  • Product details

  • B: 200 – 1600 mm, intermediate sizes 201 – 1599 in increments of 1 mm
  • H: 215 – 1615 mm, intermediate sizes 216 – 1614 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

UL, weights

H B [mm]
H 200 300 400 500 600 800 1000 1200 1400 1600
mm kg

215

3

3

3

4

4

5

6

7

8

9

315

3

3

4

4

5

6

7

8

9

10

415

3

4

4

5

5

6

7

8

9

10

515

4

4

5

5

6

7

8

9

10

11

615

4

5

5

6

7

8

9

10

11

12

715

5

5

6

7

8

9

10

11

12

13

815

5

6

7

8

9

10

11

12

13

14

1015

7

8

9

10

11

12

13

14

15

16

1215

9

10

11

12

13

14

15

16

17

18

1415

11

12

13

14

15

16

17

18

19

20

1615

13

14

15

16

17

18

19

20

21

22


Border fixing holes – UL 00146037_0


UL: Standard sizes, width, no. of flange holes

Width No. of holes
B n T₁ T₂
mm mm

200

1

100

300

1

150

400

2

303

48.5

500

2

403

48.5

600

3

252

48.5

800

3

352

48.5

1000

3

452

48.5

1200

3

552

48.5

1400

3

652

48.5

1600

4

501

48.5


UL: Standard sizes, height, no. of flange holes

Height No. of holes
H n T₃ T₄
mm mm

215

1

107.5

315

1

157.5

415

1

207.5

515

1

257.5

615

2

320

147.5

715

2

420

147.5

815

3

260

147.5

1015

3

360

147.5

1215

3

460

147.5

1415

3

560

147.5

1615

4

440

147.5


UL: Intermediate sizes, width, no. of flange holes

Width No. of holes
B n T₁ T₂
mm mm

201 – 396

1

B ∕ 2

397 – 596

2

B − 97

48.5

597 – 1596

3

(B − 97) ∕ 2

48.5

1597 – 1599

4

(B − 97) ∕ 3

48.5


UL: Intermediate sizes, height, no. of flange holes

Height No. of holes
H n T₃ T₄
mm mm

216 – 614

1

H ∕ 2

616 – 814

2

H − 295

147.5

816 – 1614

3

(H − 295) ∕ 2

147.5


Installation details, Basic information and nomenclature

  • Installation details
  • Basic information and nomenclature

Installation and commissioning

  • Horizontal airflow: Vertical installation
  • Vertical airflow: Installation into ceilings, upward airflow; horizontal installation
  • Straight upstream section required (at least B + H) on the positive pressure side of fans
  • Ensure a gradual start-up of fans to avoid a sudden pressure increase
  • Only for installation in internal spaces

Nomenclature

LWA [dB(A)]

A-weighted sound power level of air-regenerated noise for the mechanically self-powered damper

A [m²]

Upstream cross section

v [m/s]

Airflow velocity based on the upstream cross section

V [m³/h] and [l/s]

Volume flow rate

Δpst [Pa]

Static differential pressure

Δpt [Pa]

Total differential pressure


All sound power levels are based on 1 pW.

Principal dimensions

B [mm]

Duct width

H [mm]

Duct height

n [ ]

Number of flange screw holes

m [kg]

Weight

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