Site Assembly Clip-On Louvres

For intake or extract air, the 45° blades are fixed at optional 75mm and 100mm centres and have excellent integral rain defence features.

The louvre blade is snapped into position via the sprung blade clip fitted onto the rear mullions giving an attractive, continuous appearance. Excellent for large louvred areas.


From extruded aluminium sections, mullions 3.0mm thick, flashing sections 2.0mm thick, blades 2.0mm thick. Louvres can be supplied in kit format for site assembly or in manufactured panels to suit irregular shapes.

Size and Weight

From 600 x 600 to see technical sales office.

Average weight: 75mm louvre 12.75kg/m2, 100mm louvre 16.5kg/m2.

Average free area: 48%.

Rain Defence

The 75mm louvre system has been tested by BSRIA to European standard EN13030:2002 and achieves Class C – (80 – 94.9 % effectiveness).


Matt black rear blanking panels.

Insulated blanking panels (Thermal & Acoustic).

Mitred corners.


Insect screen (Fixed or Removable), Security, Special shapes, Circular, triangular etc.

Spec with NBS Chorus
The GDL Site Assembly Clip on Louvres
Site Assembly Clip-On Louvres

Louvre range

Sand trap Louvre product image
Sand Trap Louvres

Sand Trap Louvres

The double row of vertically staggered blades trap the airborne particles which are evacuated via an integral drain-off chute to the atmosphere.