UL_img_01psd.png
Non-return damper, variant UL-1

UL_img_04psd.png
Front frame

Frame with fixing holes

UL_img_03psd.png
Blades with restrictor

Blades with restrictor

UL_img_01psd.png
UL_img_04psd.png
UL_img_03psd.png

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
  • Maximum width of 1600 mm, maximum height of 1615 mm
  • Frame with fixing holes along the perimeter
  • Available in standard sizes and intermediate sizes (in increments of 1 mm)
  • Non-return damper with formed aluminium blades for normal requirements; blades are fitted with seals

 

Optional equipment and accessories

  • Installation subframe
  • Powder coating, RAL CLASSIC colour

 


 


 

General information

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

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


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


Construction features

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


Accessories

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


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

Description

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


Construction features

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





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


Technical information

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

  • Function
  • TECHNICAL DATA
  • QUICK SIZING
  • SPECIFICATION TEXT
  • ORDER CODE
  • RELATED PRODUCTS
Schematic illustration of UL-1
UL_gc_01ai.png

1 Frame

2 Blades (closed)

3 Mullion from B = 997 mm

4 Travel stop (angle section)

5 Blades (open)

6 Blade restrictor

7 Blade tip seals

8 Side bar

UL_gc_01ai.png
UL_gc_02ai.png

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 sizes200 × 215 – 1600 × 1615 mm
Volume flow rate range110 – 6460 l/s or 396 – 23256 m³/h at 2.5 m/s
Total differential pressure

2.5 m/s at 23 Pa (UL-1)

Maximum permissible differential pressure in closing direction100 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. Precise intermediate values can be calculated with our Easy Product Finder design program.

UL, width 200 – 600 mm, volume flow rate at 2.5 m/s

H

B

200300400500600
l/sm³/hl/sm³/hl/sm³/hl/sm³/hl/sm³/h
2151103961605762157742709723251170
315160576235846315113439514224751710
4152107563101116415149452018726252250
5152609363851386515185464523227752790
61531011164601656615221477027729253330
715360129653519267152574895322210703852
8154101476610219681529341020367212204392
101551018367602736102036721270457215205472
121561021969103276122043921520547218206552
1415710255610603816142051121770637221207632
1615810291612104356162058322020727224208712


UL, width 800 – 1600 mm, volume flow rate at 2.5 m/s

H

B

8001000120014001600
l/sm³/hl/sm³/hl/sm³/hl/sm³/hl/sm³/h
21543015485401944645232275527188603096
3156302268790284494534021100396012604536
415830298810403744125045001450522016605976
5151030370812904644155055801800648020607416
6151230442815405544185066602150774024608856
71514305148179064442150774025009000286010296
815163058682040734424508820285010260326011736
10152030730825409144305010980355012780406014616
121524308748304010944365013140425015300486017496
1415283010188354012744425015300495017820566020376
1615323011628404014544485017460565020340646023256



Differential pressure

v [m/s]UL-1UL-2

Δpt [Pa]

0.5

11

11

1

14

15

220

25

3

26

34

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


Accessories

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


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: 23 Pa at 2.5 m/s
  • Maximum differential pressure in closing direction: 100 Pa
  • Operating temperature: -20 to 80 °C


Sizing data

  • qv [m3/h] volume flow rate
  • Δpt [Pa] total differential pressure
  • v [m/s] airflow velocity

UL–1/800 × 515/ER/P1 - RAL 9010
|||||
12345

1 TypeUL 
Non-return damper 

2 Airflow direction
1 Airflow directed towards the installation side
2 Airflow directed towards the rear side (intake) 

3 Nominal size [mm]
B × H 

4 Installation subframe
No entry required: None
ER With 

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


  • Gloss level
  • RAL 9010 50 %
  • RAL 9006 30 %
  • All other RAL colours 70 %




Order example: UL-1/800×515/ER/P1-RAL9010
TypeUL
Airflow directionAirflow directed towards the installation side
Nominal size [mm]Width 800, height 515
Installation subframeWith installation subframe
SurfacePowder-coated RAL 9010, pure white
Accessories

Type Installation subframe

Dimensions and weight, Product details

  • DIMENSIONS AND WEIGHT
  • PRODUCT DETAILS
UL-1
UL-1
UL-1
UL-1

Dimensions

  • 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

Flow cross section to calculate the airflow velocity

  • A = B × H

Unit of measure for B and H: m




Weight [kg]

H

B

2003004005006008001000120014001600
2153334456789
31533445678910
41534455678910
515445567891011
6154556789101112
71555678910111213
815567891011121314
101578910111213141516
12159101112131415161718
141511121314151617181920
161513141516171819202122
Fixing holes in the frame – UL
UL_gc_05ai.png
UL_gc_05ai.png
UL_gc_06ai.png
UL_gc_11ai.png
UL_gc_11ailink.ai.link
UL_gc_08ai.png
UL_gc_09ai.png

UL, standard sizes, width, no. of flange holes

B

No. of holes n

T1

T2

2001–100
3001–150
400230348.5
500240348.5
600325248.5
800335248.5
1000345248.5
1200355248.5
1400365248.5
1600450148.5


UL, standard sizes, height, no. of flange holes

H

No. of holes n

T3

T4

2151–107.5
3151–157.5
4151–207.5
5151–257.5
6152320147.5
7152420147.5
8153260147.5
10153360147.5
12153460147.5
14153560147.5
16154440147.5


UL, intermediate sizes, width, no. of flange holes

B

No. of holes n

T1

T2

201 – 3961–B/2
397 – 5962B − 9748.5
597 – 15963

(B − 97)/2

48.5
1597 – 15994

(B − 97)/3

48.5


UL, intermediate sizes, height, no. of flange holes

H

No. of holes n

T3

T4

216 – 6141–

H/2

616 – 8142H − 295147.5
816 – 16143

(H − 295)/2

147.5


Installation and commissioning

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


The airflow downstream of a fan is characterised by strong turbulence, and there is no uniform velocity profile. As a consequence, the blades of the non-return dampers are not uniformly subject to the airflow, and this may result in individual blades becoming subject to forces that might lead to mechanical damage.
Safe operation requires a straight upstream section of at least B + H.

,

Downloads

product information

  • Product data sheet Type UL

    UL_PD_2022_09_21_DE_en Product data sheet 510 KB pdf

certificates

  • Declaration of conformity or declaration of incorporation Type UL

    Declaration of conformity or declaration of incorporation 130 KB pdf

  • Non-CE Manufacturer's statement UL

    UL_NotCE_2022_02_08_14_43_02_DE_en Certificate 1,7 MB pdf

operation manuals

  • Installation manual Type UL

    2018/10/A00000053072 Installation manual 440 KB pdf

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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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