Acoustic Louvres Type ‘NL & NLH’
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
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Product Information
Optional equipment and accessories
- Powder-coated
- NL: Acoustic louvre
- NL-H: Double bank for demanding acoustic requirements
- NL-D: Non-active section for a uniform appearance
- S: Galvanised sheet steel
- A: Aluminium
- Casing
- Sound absorbing blades (NL, NL-D)
- Bird mesh (NL, NL-D)
- Blades (NL-D)
- Rear blanking plate (NL-D)
- 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)
- 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)
- 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
- 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-free as construction and materials are not subject to wear