BL50D Chevron/ Double Bank Aluminium Louvres

50mm pitch chevron aluminium louvres for enhanced weather protection and also to restrict views through the louvre. Class A weather tested

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BL50D is a non-vision double bank or chevron ventilation and screening louvre, with superior weathering performance.

Louvre blades are pitched at 50mm and can be fitted into frames with overall depths of 99mm or 143mm.

It can also be frameless when supplied as a kitset or build on site louvre system.

This system is predominantly for use where non-vision and/or a higher weather rating is required, and is suitable for use in panels, doors, penthouse turrets, screening applications, in both, factory assembled panels, and kitset site-built options.


Supplied as standard with flanges undrilled. Fixing through flange or neck.

Guard (mesh) Options:

Bird  Guard – Galvanised steel with 12.7mm x 12.7mm apertures

Vermin Guard – Galvanised Steel with 6.35mm x 6.35mm apertures

Insect mesh – HDPE, PVC Coated fibreglass and stainless steel options


Mill finish as standard (untreated and unpolished aluminium) Polyester Powder coatings to any standard RAL or BS 4800 range colours Special finishes available on request

Recommended maximum. size for a single unit: Upto 2000 x 2000. Larger sizes accommodated in multi-panel systems.

Nominal free area: 51.2% with birdguard fitted

Maximum BSRIA weather test rating (simulated rainfall of 75mm/hr, wind speed of 13m/sec):

99.49% with bird mesh  (class A)

98.69%  with insect mesh (class A)


Face Velocity (metres per second) 0.5    1.0     1.5      2.0          Discharge with bird mesh fitted

Pressure drop (Pascals)                 3.51  14.04  31.59  56.16

BL50D download

Click to download PDF data sheet

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