Type WGF

Specifically for façade installation

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

Maximum width of 2000 mm, maximum height of 2500 mm per section
For the installation into façades or for the construction of enclosures for machinery or electrical equipment
Low differential pressure due to aerofoil blades
Low air-regenerated noise
All aerodynamic data is measured in aerodynamics and acoustics laboratories
Variants made of galvanised sheet steel or aluminium
Flexible arrangement of sections for covering large areas (should then be fixed on a support structure which is to be provided by others)

Optional equipment and accessories

Corner section
Insect screen
Powder-coated or anodised

External weather louvre, variant WGF-AL-T 00136517_0

Regular blades

Application

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

Special characteristics

Low differential pressure and low noise due to aerofoil blades
Large-size covering of air intake and discharge openings on external walls, and complete façades; uniform look with regular blades, without distracting flanges
Robust construction
Very 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)

Variants

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

Construction

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

Parts and characteristics

Serrated angle sections (left and right)
Regular blades and bottom blade
Wire mesh
Optional insect screen
Fixing 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 mm
Wire mesh at the rear, mesh aperture 20 × 20 × 1.8 mm
Optional 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 sections
Serrated angle sections made of formed galvanised sheet steel
Wire mesh made of galvanised steel
Serrated angle sections, powder-coated black (RAL 9005)
P1: Powder-coated, RAL CLASSIC colour
PS: 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

Schematic illustration of WGF 00102795_0

① Middle section WGF-AL-T
② Corner section WGF-AL-E
① Bottom blade
② Regular blades
③ Fixing element for wire mesh
④ Serrated angle section, right side
⑤ Serrated angle section, left side
⑥ Fixing holes
⑦ Fixing element to join serrated angle sections
⑧ Wire mesh; additional insect screen as an option
⑨ Fixing element for blades

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 in external 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 enter together with the air.

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

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)

Installation into rectangular ducts (installation types A and B)

A Exhaust air
B Fresh air

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_WA apply to external weather louvres with a flow cross section of 1 m².

WGF, volume flow rate at 2.5 m/s

Height	Width [mm]
Height	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

Height	Corner section 90° [mm]
Height	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

v	Installation type
v	A and B		C		D
v	Δp_t	L_WA	Δp_t	L_WA	Δp_t	L_WA
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

Rectangular external weather louvres for façade installation, as a protection of air conditioning systems against the direct ingress of rain, leaves and birds into fresh air 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 blades
Large-size covering of air intake and discharge openings on external walls, and complete façades; uniform look with regular blades, without distracting flanges
Robust construction
Very 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 %

Materials and surfaces

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

Construction

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

Technical data

Nominal sizes (middle section): 1000 × 500 – 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)

Sizing data

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

Air-regenerated noise

L_WA _______________________ [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.

Type
WGF External weather louvres for façades

Material
No entry: galvanised steel
AL Aluminium

Section
E Corner section
T Middle section

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

Nominal size [mm]
B × H

Surface
       No entry: standard construction
P1       Powder-coated, RAL Classic colour
PS       Powder-coated, DB colour
       Only for WGF-AL
S2       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 %

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 a bottom 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

Variants, Dimensions and weight

Materials

Part	Order code detail	Material	Notes
Blades	–	Formed galvanised sheet steel, material no. DX51D+Z150-200-NAC	Material thickness 1,25 mm
Blades	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
Wire mesh	2	Stainless steel, material no. 1.4301	Only WGF-AL

Surfaces

Part	Order code detail	Surface	Notes
Blades	–	Untreated
Blades	P1-RAL ...	Powder-coated, RAL colour ... CLASSIC
Blades	PS-NCS ...	Powder-coated, NCS colour ...
Blades	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 %

WGF Middle section

Flow cross section to calculate the airflow velocity

A = B × (H − 0.125)

Unit of measure for B and H: mm

WGF, weight

H	WGF-T						WGF-AL-T
H	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

H	WGF-E	WGF-AL-E
H	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

Installation details, Basic information and nomenclature

Façade installation on support structure

n = any number of middle sections
① Corner section (WGF-E)
② Support structure provided by others, e.g. angle sections
③ Support structure provided by others, e.g. U-channel sections
④ Middle section (WGF-T)

Installation and commissioning

Fix the top and bottom blades to both serrated angle sections
Align 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 sections
Fix wire mesh to the rear of the blades
Install additional sections
Connect the serrated angle sections of the individual louvre sections with each other

Nomenclature

L_WA [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_t [m/s]

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

V [m³/h] and [l/s]

Volume flow rate

Δp_t [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

Downloads

product information

Print page Type WGF
Product data sheet Type WGF

Product data sheet 2,9 MB pdf

operation manuals

Installation manual Type WGF

Installation manual 160 KB pdf

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