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

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