BL50RF Reverse Flange Series

Aluminium extrusions type 6063-T6 to BS1474 having a minimum thickness of 1.6mm. Mitred frame joints TIG welded for additional strength.

The louvre comprises louvre blades inclined at 45° and mounted at 50mm pitch within 50mm, 75mm or 100mm deep frame. Galvanised bird screen supplied as standard. Reverse flange/reverse angle type frame for mounting either on the external face of the structure over the opening, or for installing through the rear of the opening where external access is not practical. 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.

Louvre sizes made to suit customer requirements.

Recommended maximum. size for a single unit: 1000 x 2000 for 50mm deep system. Upto 2000 x 2000 for the 75mm and 100mm deep systems. Larger sizes accommodated in multi-panel systems.

Nominal free area: 50%

Maximum BSRIA weather test rating (simulated rainfall of 75mm/hr, wind speed of 13m/sec): 89.42% Class C.

Face Velocity (metres per second)
Pressure drop (Pascals)2.489.9122.339.65

Supplied as standard with flanges undrilled. Fixing through flange.

• 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