Product Info

Fieger Louvre Window – Type FLW 40

The FLW 40 represents a landmark in the development glass-louvred ventilators. The triple-glazed louvre blades offer a number of benefits, including exceptional U-values and improved sound reduction..

The increased rigidity of the louvre structure means that individual blade heights of up to 500mm are now possible. This not only improves its appearance, reducing the overall number of louvres, but also enhances outward vision and light transmission.

In addition, this feature can assist the architect in his design concept, for example, matching the louvre height to adjacent linear building features, such as cladding.

The design of the FLW 40 combines high quality construction with flush-fitting louvres & frames to give a distinctive aesthetic finish.

The coldbridge-free framing and maintenance-free rack & pinion mechanism provide the reliability of performance expected of Fieger Louvre Windows.

The triple-glazing enables particularly low U-values to be achieved – 1.2 W/m2K calculated in accordance with EN 10077-2. The benefit to architects and engineers is that functional requirements, such as smoke venting, can be fulfilled without compromising the overall U-value of the building envelope.

In terms of performance, the FLW 40 achieves a high aerodynamic coefficient; ranging from 0.57 to 0.61 ??, subject to size and aspect ratio. Independent tests show that the FLW 40 has a surface area leakage rate of 0.00 m3/hr m2 at 50 Pascals; in accordance with EN 12207. The Smotec version of the FLW 40 has been fully tested and certified under EN 12101-2 as a natural smoke & heat exhaust ventilator (NSHEV).

  • Weather tested to EN 12208: Class 6A
  • Air leakage tested to EN 12207: Class 4
  • Smoke vent tested to EN 12101-2
  • Sound attenuation: R = 39 dB minimum
  • The louvres are available as 40mm triple-glazed insulated blades and can be configured to suit a variety of opening sizes and applications. Insulated aluminium blades can also be supplied.

    A range of actuators are available as standard, including 230 volt or 24 volt DC motor drives as well as pneumatic cylinders. Manual operation is provided by a handle fixed to the frame or a crankhandle, which can be either fixed or detachable. Where necessary, a motorised version can be provided, which is programmed to avoid finger-trapping. The FLW 40 can be supplied with a range of fixing adaptors, to facilitate installation into brickwork, curtain walling & glazing. We can meet specific requirements across a range of sizes, colour finishes and glass specifications.

    Typical glazing specifications include: Toughened outer safety glass, an Argon filled cavity, a 4mm Float glass centre pane, an Argon filled cavity and laminated Low-E inner glass. Float and solar reflective glass can also be provided as standard, whilst special glazing can be provided on request.

    The FLW range complies with The Building Regulations in the UK and specifically Approved Document B: Fire Safety, Approved Document L: Conservation of Fuel and Power and Approved Document N: Glazing – Safety in relation to impact, opening and cleaning.

    The “Downloads” area of the website contains copies of all relevant data sheets, including our EN 12101-2 certification, the independent air leakage and weathering tests to EN 12207 & EN 12208, as well as the Thermal Performance test in accordance with DIN 52619-1 and the Sound Reduction Test Report as per EN 20140.