00136524_0
Acoustic louvre, variant NL-A


00136524_0

NL

With sound reduction characteristics

Acoustic louvres 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 1800 mm, maximum height of 2250 mm
  • Low differential pressure due to aerofoil blades
  • Low air-regenerated noise
  • All aerodynamic data is measured in aerodynamics and acoustics laboratories
  • Absorption material faced with glass fibre fabric and retained by perforated sheet metal
  • Double bank of louvre blades for demanding acoustic requirements
  • Non-active section, without acoustic function, for a uniform appearance
  • Multi-section constructions for large dimensions


Optional equipment and accessories

  • Powder-coated

Application

Application

  • Acoustic louvres of Type NL 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.
  • Weather and noise protection with a compact-depth unit

Special characteristics

  • Two construction depths for normal and demanding acoustic requirements
  • Aerofoil blades
  • Absorption material retained by perforated sheet metal

Nominal sizes

  • B: 300, 450, 600, 750, 900, 1050, 1200, 1350, 1500, 1650, 1800 mm
  • Width subdivided: 1950, 2100, 2250, 2400, 2550, 2700, 2850, 3000, 3150, 3300, 3450, 3600 mm
  • H: 450, 600, 750, 900, 1050, 1200, 1350, 1500, 1650, 1800, 1950, 2100, 2250 mm
  • Height subdivided: 2400, 2550, 2700, 2850, 3000, 3150, 3300, 3450, 3600, 3750, 3900, 4050, 4200, 4350, 4500 mm
  • Any combination of B × H
  • Other dimensions upon request

Description

Variants

  • NL: Acoustic louvre
  • NL-H: Double bank for demanding acoustic requirements
  • NL-D: Non-active section for a uniform appearance

Construction

  • S: Galvanised sheet steel
  • A: Aluminium

Parts and characteristics

  • Casing
  • Sound absorbing blades (NL, NL-D)
  • Bird mesh (NL, NL-D)
  • Blades (NL-D)
  • Rear blanking plate (NL-D)

Construction features

  • Aerofoil blades, 150 mm blade pitch
  • Casing with fixing holes for wall installation
  • Absorption material faced with glass fibre fabric and retained by perforated sheet metal (NL, NL-H)
  • Bird mesh 12 × 12 × 1 mm (NL, NL-H)

Materials and surfaces

  • Casing and blades made of galvanised sheet steel (S) or aluminium (A)
  • Perforated sheet metal to retain absorption material is made of galvanised sheet steel (NL, NL-H)
  • Bird mesh made of galvanised steel (NL, NL-H)
  • Absorption material is mineral wool (NL, NL-H)


Mineral wool

  • To EN 13501, fire rating class A1, non-combustible
  • RAL quality mark RAL-GZ 388
  • Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EG
  • Faced with glass fibre fabric as a protection against erosion through airflow velocities of up to 20 m/s
  • Inert to fungal and bacterial growth

Standards and guidelines

  • Insertion loss and sound power level of air-regenerated noise tested to ISO 7235
  • Sound reduction index determined according to EN ISO 10140-2 und EN ISO 717-1

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

  • Function
  • TECHNICAL DATA
  • QUICK SIZING
  • SPECIFICATION TEXT
  • ORDER CODE
Schematic illustration of NL 00100015_0
① Casing
② Bird mesh
③ Absorption material
④ Glass fibre fabric
⑤ Perforated sheet metal


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.

Variants, Dimensions and weight

  • Variants
  • Dimensions and weight

NL

Variant

  • Acoustic louvre

Parts and characteristics

  • Casing
  • Sound absorbing blades
  • Bird mesh

Construction features

  • Aerofoil blades, 150 mm blade pitch
  • Casing with fixing holes for wall installation
  • Absorption material faced with glass fibre fabric and retained by perforated sheet metal
  • Bird mesh 12 × 12 × 1 mm

Materials and surfaces

  • Casing and blades made of galvanised sheet steel (S) or aluminium (A)
  • Perforated sheet metal to retain absorption material is made of galvanised sheet steel
  • Bird mesh made of galvanised steel
  • Absorption material is mineral wool


Mineral wool

  • To EN 13501, fire rating class A1, non-combustible
  • RAL quality mark RAL-GZ 388
  • Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EG
  • Faced with glass fibre fabric as a protection against erosion through airflow velocities of up to 20 m/s
  • Inert to fungal and bacterial growth

NL-H

Variant

  • High performance acoustic louvre (double bank)

Parts and characteristics

  • Casing
  • Sound absorbing blades
  • Bird mesh

Construction features

  • Aerofoil blades, 150 mm blade pitch
  • Casing with fixing holes for wall installation
  • Absorption material faced with glass fibre fabric and retained by perforated sheet metal
  • Bird mesh 12 × 12 × 1 mm

Materials and surfaces

  • Casing and blades made of galvanised sheet steel (S) or aluminium (A)
  • Perforated sheet metal to retain absorption material is made of galvanised sheet steel
  • Bird mesh made of galvanised steel
  • Absorption material is mineral wool


Mineral wool

  • To EN 13501, fire rating class A1, non-combustible
  • RAL quality mark RAL-GZ 388
  • Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EG
  • Faced with glass fibre fabric as a protection against erosion through airflow velocities of up to 20 m/s
  • Inert to fungal and bacterial growth

NL-D

Variant

  • Non-active section for a uniform appearance

Parts and characteristics

  • Casing
  • Blades
  • Rear blanking plate

Construction features

  • Aerofoil blades, 150 mm blade pitch
  • Casing with fixing holes for wall installation

Materials and surfaces

  • Casing and blades made of galvanised sheet steel (S) or aluminium (A)

Materials

Part Order code detail Material Notes

Casing and blades

S

Galvanised sheet steel


A

Aluminium


Perforated sheet metal to retain absorption material

Galvanised sheet steel

Only NL, NL-H

Bird mesh

Galvanised steel

Only NL, NL-H

Absorption material

Mineral wool

Only NL, NL-H


Surfaces

Part Order code detail Surface Notes

Casing and blades

Untreated


P1-RAL ...

Powder-coated, RAL colour ... CLASSIC



Installation details, Basic information and nomenclature

  • Installation details
  • Basic information and nomenclature

Installation and commissioning

  • Installation either without installation subframe or with timber subframe, fixing angles, or steel frame made of angle sections (to be provided by others)
  • Install subdivided constructions either horizontally next to each other or vertically on top of each other
  • Seal perimeter gap with mastic
  • Fix cover strips

Installation information

  • Casing with slotted holes of 10 × 15 mm along the side panels

Downloads

product information

certificates

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We are here for you

Please specify your message and type of request.
Tel.: +61 (02) 8923 2551

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Fields marked with an (*) are required fields.

Contact

Thank you for your message!

Your message is send and will be processed shortly.
Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +61 (02) 8923 2551