Aluminium Louvre Grille 491

Framed-panel, single-bank, fixed-louvre aluminium ventilator with indirect airflow, for wall recess mounting.

  • Enables secure, highly weather resistant ventilation with exclusion of insects. Physical free area: 26 %.
  • Aluminium profiles with choice of finish. Blades at 33.3 mm centres.
  • Suitable for insertion into wall openings from exterior with 21 mm (maximum) flange overlap. 5 mm external flange projection.
  • Interior reveal fixing.
  • Dimensions (minimum): 100 x 100 mm. Made to measure.
  • Panel thickness: 33.5 mm.

General information


Aluminium alloy: AlMgSi 0.5 to DIN 1748

Uniclass 2015

Pr_30_59_48_04 Aluminium louvre panel unitsPrimary


L10/650 Metal louvres

Specification data - Aluminium louvre panel units

Product Reference

Aluminium Louvre Grille 491

Dimensions of aperture (w x h x wall thickness)

___ x ___ x ___ mm

As drawing ___



Nonstandard option. Required for panels larger than 3 m².

Bracket type 418

Standard option. Screw fix to reveal.

Spring clips type 419

Nonstandard option. For small panels.

As drawing ___

Blade fixing


Standard option.


Nonstandard option. For extra strength.

Finish (aluminium components)

Anodized, natural

20 µ. Type E6/ C34 to DIN 17611.

Polyester powder coating, RAL colour ___, sheen ___ %

60–70 µ.

Polyester powder coating, Syntha Pulvin colour ___, sheen ___ %

60–70 µ.

Other requirements


Mesh, 2.3 x 2.3 mm

Nonstandard option. Grade 304 stainless steel.

Mesh, 6 x 6 mm

Standard option. Grade 304 stainless steel.

Water channel

Bottom profile with projecting interior collection channel, weathered to exterior.

Standard product features


Aluminium alloy: AlMgSi 0.5 to DIN 1748.

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