Type 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 or anodised
small_tab1_Serie NL
  • Application
  • Description

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
  • Absorbtion material retained by perforated sheet metal

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

Technical information

  • Function
  • Technical data
  • Quick sizing
  • Specification text
  • Order code
nl

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.

nl
nl

 

Rectangular 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.

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

Insertion loss measured according to ISO 7235.

Special characteristics

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

Construction

  • S: Galvanised sheet steel
  • A: Aluminium
nl

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Contact

Thank you for your message!

Visual contact Visual contact

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.: +43 1 250 43-0| Fax: +43 1 250 43 34