Details always make a big difference. Visually the FLW 40 has a slightly deeper frame, but this of course means much better thermal insulation. Which is also why the FLW 40 provides double the value. On the one hand, it’s architecturally good‑looking and on the other it reduces energy costs.

Louvre blade design:

Louvre frames have mitred corners with internal brackets and screw-fixed. Louvre blades are centre-pivoted and close flush with the external vent frame.

Frame design:

Thermally broken aluminium extrusions. Frame sections have mitred corner with internal brackets and press-formed.


Triple-glazed or insulated aluminium panel with a total thickness of 36-40 mm. Including EPDM gaskets.

FLW 40 is available with manual, electric and pneumatic actuators.
The FLW 40 is available with 17 x 40 mm or 25 x 40 mm integrated glazing adapters, as well as a range of other fixing adapters, which can be provided to suit most applications.