Application

Application

EXTERNAL WEATHERLOUVRE, VARIANT WGF-AL-T

REGULAR BLADES

BOTTOM BLADE

SERRATED ANGLESECTION

TYPE WGF

SPECIFICALLY FOR FAÇADE INSTALLATION

External weather louvres – specifically for façade installation – as a protection ofair conditioning systems against the direct ingress of rain, leaves and birds intofresh air and exhaust air openings

Maximum width of 2000 mm, maximum height of 2500 mm per sectionFor the installation into façades or for the construction of enclosures formachinery or electrical equipmentLow differential pressure due to aerofoil bladesLow air-regenerated noiseAll aerodynamic data is measured in aerodynamics and acousticslaboratoriesVariants made of galvanised sheet steel or aluminiumFlexible arrangement of sections for covering large areas (should then befixed on a support structure which is to be provided by others)

Optional equipment and accessories

Corner sectionInsect screenPowder-coated or anodised

Homepage > PRODUCTS > External louvres - louvre blades > External weather louvres > External weather louvres > Type WGF

External weather louvres of Type WGF for the fresh air and exhaust air openings of air conditioning systemsProtection against the direct ingress of rain as well as against leaves and birdsRecommended face velocity for fresh air openings: 2 – 2.5 m/s max.

Special characteristics

Low differential pressure and low noise due to aerofoil bladesLarge-size covering of air intake and discharge openings on external walls, and complete façades; uniform look with regular blades, without distracting flangesRobust constructionVery large dimensions (height and width) are available since any number of sections can be fitted side by side or on top of each other (support structure required)Free area approx. 50 %

Nominal sizes

Middle section

B: 1000, 1200, 1400, 1600, 1800, 2000 mm (intermediate sizes: 201 – 1999 mm, in increments of 1 mm)H: 500, 625 , 750, 875, 1000, 1250, 1500, 1750, 2000, 2250, 2500 mm (intermediate sizes: 1125 – 2375 mm, in increments of 125 mm)Any combination of B × H

Corner section

B: 600 × 600 mm (angle)H: 500, 625 , 750, 875, 1000, 1250, 1500, 1750, 2000, 2250, 2500 mm (intermediate sizes: 1125 – 2375 mm, in increments of 125 mm)

Description

Variants

WGF-T: Façade weather louvre made of galvanised sheet steel, middle sectionWGF-E: Façade weather louvre made of galvanised sheet steel, corner sectionWGF-AL-T: Façade weather louvre made of aluminium, middle sectionWGF-AL-E: Façade weather louvre made of aluminium, corner section

Construction

Wire mesh made of galvanised steel2: Wire mesh, stainless steel (only WGF-AL)

Parts and characteristics

Serrated angle sections (left and right)Regular blades and bottom bladeWire meshOptional insect screenFixing elements for the blades, serrated angle section (if B > 2000 mm: combination of several serrated angle sections) and wire mesh

Construction features

Free area of approx. 50 %Serrated angle section, with fixing holes on side and rear, material thickness 3 mmWire mesh at the rear, mesh aperture 20 × 20 × 1.8 mmOptional insect screen at the rear, mesh aperture 1.25 × 1.25 × 0.4 mm

Materials and surfaces

Blades made of formed galvanised sheet steel or extruded aluminium sectionsSerrated angle sections made of formed galvanised sheet steelWire mesh made of galvanised steelSerrated angle sections, powder-coated black (RAL 9005)P1: Powder-coated, RAL CLASSIC colourPS: Powder-coated, NCS or DB colour

Maintenance

Maintenance-free as construction and materials are not subject to wear

TECHNICAL INFORMATION

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

Functional description

External weather louvres are externally mounted air transfer devices for the fresh air and exhaust air of air conditioning systems. They are installed inexternal walls and façades. Their narrowly arranged blades give good protection against the direct ingress of rain as well as against leaves and birds.

Under certain unfavourable conditions, such as heavy rain, and depending on the airflow velocity it might happen that slight quantities of water entertogether with the air.

This is why the airflow velocity in fresh air openings should not exceed 2 – 2.5 m/s.

Schematic illustration of WGF

① Middle section WGF-AL-T② Corner section WGF-AL-E① Bottom blade② Regular blades③ Fixing element for wire mesh④ Serrated angle section, right side⑤ Serrated angle section, left side⑥ Fixing holes⑦ Fixing element to join serrated angle sections⑧ Wire mesh; additional insect screen as an option⑨ Fixing element for blades

Nominal sizes (middle section) 1000 × 500 to 2000 × 2500 mm

Volume flow rate range (middle section) 940 – 11880 l/s or 3384 – 42768 m³/h

Free area Approx. 50 %

Total differential pressure – exhaust air 50 Pa at 2.5 m/s (façade installation)

Total differential pressure – fresh air 60 Pa at 2.5 m/s (façade installation)

Quick sizing tables provide a good overview of the volume flow rates with an airflow velocity of 2.5 m/s. Values for intermediate widths can be interpolated.Precise intermediate values and volume flow rates for other airflow velocities can be calculated with our Easy Product Finder design programme.

The sound power levels L apply to external weather louvres with a flow cross section of 1 m².

WGF, volume flow rate at 2.5 m/s

HeightWidth [mm]

1000 1200 1400 1600 1800 2000

mm l/s m³/h l/s m³/h l/s m³/h l/s m³/h l/s m³/h l/s m³/h

500 940 3384 1125 4050 1315 4734 1500 5400 1690 6084 1875 6750

625 1250 4500 1500 5400 1750 6300 2000 7200 2250 8100 2500 9000

750 1565 5634 1875 6750 2190 7884 2500 9000 2815 10134 3125 11250

875 1875 6750 2250 8100 2625 9450 3000 10800 3375 12150 3750 13500

1000 2190 7884 2625 9450 3065 11034 3500 12600 3940 14184 4375 15750

1250 2815 10134 3375 12150 3940 14184 4500 16200 5060 18216 5630 20268

1500 3440 12384 4125 14850 4815 17334 5500 19800 6190 22284 6880 24768

1750 4065 14634 4875 17550 5690 20484 6500 23400 7310 26316 8130 29268

2000 4690 16884 5630 20268 6560 23616 7500 27000 8440 30384 9380 33768

2250 5310 19116 6380 22968 7440 26784 8500 30600 9560 34416 10630 38268

2500 5940 21384 7130 25668 8310 29916 9500 34200 10690 38484 11880 42768

WGF, corner section, volume flow rate at 2.5 m/s

HeightCorner section 90° [mm]

600/600

mm l/s m³/h

500 1125 4050

625 1500 5400

750 1875 6750

875 2250 8100

1000 2625 9450

1250 3375 12150

1500 4125 14850

1750 4875 17550

2000 5630 20268

2250 6380 22968

2500 7130 25668

Differential pressure and sound power level

WA

vInstallation type

A and B C D

v Δp L Δp L Δp L

m/s Pa dB(A) Pa dB(A) Pa dB(A)

1.5 22 40 18 38 25 45

2 38 49 32 47 40 54

2.5 60 56 50 54 55 61

3 85 62 75 59 90 66

4 150 70 130 68 160 75

5 230 77 200 75 250 82

6 335 83 290 81 360 88

Installation into rectangular ducts (installation types A and B)

A Exhaust airB Fresh air

Plenum installation (installation types C and D)

C Exhaust airD Fresh air

t WA t WA t WA

Rectangular external weather louvres for façade installation, as a protection of air conditioning systems against the direct ingress of rain, leaves and birds into freshair and exhaust air openings.

Ready-to-install component which consists of aerofoil rain defence blades, a wire mesh at the rear and serrated angle sections.

Special characteristics

Low differential pressure and low noise due to aerofoil bladesLarge-size covering of air intake and discharge openings on external walls, and complete façades; uniform look with regular blades, without distractingflangesRobust constructionVery large dimensions (height and width) are available since any number of sections can be fitted side by side or on top of each other (support structurerequired)Free area approx. 50 %

Materials and surfaces

Blades made of formed galvanised sheet steel or extruded aluminium sectionsSerrated angle sections made of formed galvanised sheet steelWire mesh made of galvanised steelSerrated angle sections, powder-coated black (RAL 9005)P1: Powder-coated, RAL CLASSIC colourPS: Powder-coated, NCS or DB colour

Construction

Wire mesh made of galvanised steel2: Wire mesh, stainless steel (only WGF-AL)

Technical data

Nominal sizes (middle section): 1000 × 500 – 2000 × 2500 mmVolume flow rate range (middle section): 940 – 11880 l/s or 3384 – 42768 m³/hFree area: approx. 50 %Total differential pressure – exhaust air: 50 Pa at 2.5 m/s (façade installation)Total differential pressure – fresh air: 60 Pa at 2.5 m/s (façade installation)

Sizing data

V _______________________ [m³/h]Δp _______________________ [Pa]

Air-regenerated noise

L _______________________ [dB(A)]

This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.

t

WA

Variants, Dimensions and weight

If middle sections and corner sections are arranged in vertical tiers, the upper sections will have only regular blades; only the lower sections will have abottom blade. Sections to be used as upper sections must be specified when ordering.

Order example: WGF–T/1600×1250/P1–RAL 7001

Material Galvanised steel

Section Middle section

Construction Wire mesh, galvanised steel

Nominal size 1600×1250 mm

Surface Powder-coated, RAL 7001, silver grey

Type

WGF External weather louvres for façades

Material

No entry: galvanised steelAL Aluminium

Section

E Corner sectionT Middle section

Construction

No entry: wire mesh, galvanised steel2 Wire mesh, stainless steel (only for material AL)

Nominal size [mm]

B × H

Surface

No entry: standard constructionP1 Powder-coated, RAL Classic colourPS Powder-coated, DB colour Only for WGF-ALS2 Anodised to EURAS standard, E6-C-… (31 to 35)S3 Anodised to EURAS standard, E6-C-0

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

Materials

Part Order code detail Material Notes

Blades– Formed galvanised sheet steel, material no. DX51D+Z150-200-NAC Material thickness 1,25 mm

AL Extruded aluminium sections, material no. EN AW-6060 T66 Material thickness 2 mm

Serrated angle sections – Galvanised sheet steel, material no. DX51D+Z150-200-NAC Material thickness 3 mm

Wire mesh– Galvanised steel

2 Stainless steel, material no. 1.4301 Only WGF-AL

Surfaces

Part Order code detail Surface Notes

Blades– Untreated

P1-RAL ... Powder-coated, RAL colour ... CLASSIC

BladesPS-NCS ... Powder-coated, NCS colour ...

S2 Anodised to EURAS standard, E6-C-31 to E6-C-35 Only WGF-AL

Blades S3 Anodised to EURAS standard, E6-C-0 Only WGF-AL

Serrated angle sections – Powder-coated RAL 9005, jet black Gloss level 70 %

Flow cross section to calculate the airflow velocity

A = B × (H − 0.125)

Unit of measure for B and H: mm

WGF, weight

HWGF-T WGF-AL-T

B [mm]

H 1000 1200 1400 1600 1800 2000 1000 1200 1400 1600 1800 2000

mm kg

500 16 17 18 21 23 25 12 13 14 15 16 17

625 19 22 24 27 29 32 14 16 17 18 19 21

750 23 26 29 32 35 38 17 19 20 22 23 26

875 27 30 34 37 41 44 20 22 24 25 27 30

1000 31 35 39 43 47 51 23 25 27 29 31 34

1250 33 38 43 48 53 61 28 31 34 36 39 42

1500 43 50 56 61 68 73 34 37 41 44 47 51

1750 51 59 65 71 79 86 39 43 48 51 55 59

2000 59 67 74 82 90 97 45 49 55 59 63 68

2250 67 76 83 91 102 109 50 55 62 66 71 76

2500 74 84 93 102 112 121 56 61 69 74 79 85

WGF, corner section, weight

HWGF-E WGF-AL-E

B [mm]

H 600 × 600

mm kg

500 17 13

625 22 16

750 26 19

875 30 22

1000 35 25

1250 38 31

1500 50 37

1750 59 43

2000 67 49

2250 76 55

2500 84 61

WGF Middle section

WGF Corner section

Installation details, Basic information and nomenclature

Installation and commissioning

Fix the top and bottom blades to both serrated angle sectionsAlign the serrated angle sections with both blades to the support structure and fix it (fixing material to be provided by others)Fix the remaining blades to the serrated angle sectionsFix wire mesh to the rear of the bladesInstall additional sectionsConnect the serrated angle sections of the individual louvre sections with each other

Façade installation on support structure

n = any number of middle sections① Corner section (WGF-E)② Support structure provided by others, e.g. angle sections③ Support structure provided by others, e.g. U-channel sections④ Middle section (WGF-T)

Installation on the face of a wall

n = any number of middle sections① Corner section (WGF-E)② Middle section (WGF-T)

Wall installation

n = any number of middle sections① Middle section (WGF-T)

Nomenclature

L [dB(A)]

A-weighted sound power level of air-regenerated noise for the louvre

A [m²]

Upstream cross section

v [m/s]

Airflow velocity based on the upstream cross section

v [m/s]

Airflow velocity based on the upstream cross section (type NL)

V [m³/h] and [l/s]

Volume flow rate

Δp [Pa]

Total differential pressure

All sound power levels are based on 1 pW.

Principal dimensions

B [mm]

Duct width

B₁ [mm]

Duct width for subdivided louvres

H [mm]

Duct height

H₁ [mm]

Duct height for subdivided louvres

n [ ]

Number of flange screw holes

m [kg]

Weight

WA

t

t

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