BL50DB Double Bank Aluminium Louvres

50mm pitch double bank aluminium louvres for enhanced weather protection and to restrict views through the louvre

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The louvre comprises double banked louvre blades inclined at 45° and mounted back to back at 50mm pitch within 100mm or 140mm deep frame. Galvanised bird screen supplied as standard. Frames can be flanged for surface mounting or recessed to give frameless appearance. The bottom blade is extended over the outer frame to prevent ingress of water and provide drainage from the louvre face.

Louvre blades secured by a minimum of four no.8 x 19 screws per blade to provide robust assembly. Louvres over 1000mm wide include extruded aluminium channel mullion to rear to further increase strength.

Louvre sizes made to suit customer requirements.


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


  • Insect Screen
  • Blanking Panels (single skin plate or insulated blanking panel)
  • Vermin Guard
  • Removable core/hinged core


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: 52% with birdguard fitted

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

96.5% BLS50/100DB/BG  (class B)

98.93:  BLS 50/100DB/IM (class B)


Face Velocity (metres per second) 0.5    1.0     1.5      2.0

Pressure drop (Pascals)                 4.34 17.34  39.02  69.36

BL50DB download

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