Our bigAir® roof units are system-independent. They can be installed in any stick-system assembly, tile roofs and all other pitched roof types. They are ideal for ventilating halls and other spaces topped by roofs with pitches down to 10°.
A genuine all-rounder – for everything from innovative new-builds to historic properties. The potential applications are virtually unlimited.
All Lacker louvre windows excel by their exceptionally high aerodynamic and geometric free area. For our roof louvres, this can be additionally optimized, where required, through installation of the Lacker-patented wind deflector system, which is concealed in the mullions. An optional extra which, above all, pays financial dividends.
To allow prompt and trouble-free installation, we supply the windows as fully pre-assembled units complete with glazing. This allows straightforward fitting of our roof louvre windows – in much the same way as fixed lights – by any trade contractor, with no time lost through fine adjustment of hardware etc.
Our bigAir® roof louvre units are manufactured, to your specifications, with
The production heights for glass and panel blades range from 380 mm to 480 mm depending on the place of installation.
All blades are arranged in a filigree, structural-glazing-like composition, without horizontal frame members, and close flush at the sides with the adjoining glazing or tile roof. Horizontally, the stepped sequence of glass blades emulates the lapped arrangement of roof tiles.
The sophisticated lapped tile principle adopted by our louvre windows guarantees many years of weather exclusion. This is due to the prevention of damaging accumulations of dirt at the sensitive location of the glass weatherstripping and the efficient shedding of rainwater directly over the glass steps.
The intelligent, patented bayonet fastener system allows the prompt and straightforward replacement of damaged blades by any trade contractor.
As a general rule, our roof louvre windows are manufactured in minimum widths of 500 mm and minimum heights of 430 mm. The maximum width currently runs to around 5,900 mm and the maximum height to some 6,000 mm.
The achievable production sizes depend on the
We should be glad to counsel you on the optimum window sizes for your particular scheme. With all due regard, of course, to your specific requirements and preferences. After all, our ultimate goal is to find the most economical solution for you and your project.
For all Lacker louvre windows, the pivot is located in the upper part of the blade assembly. This allows the provision of two offset weatherstrips to ensure an absolutely weathertight barrier.
The blades can be tilted at any angle up to 90°. The maximum opening angle is freely selectable. As standard, this value is preset to 85°.
The opening action of the window is such that the blades tilt outwards, with the edge of the top louvre moving away to the inside from the front edge of the weatherstrip. The system design is such that no part of the blades encroach on the internal space in either the open or closed position.
The hardware and motors for our bigAir® louvre windows are self-locking and remain weathertight even in the event of mains failure. This absolutely fail-safe, airtight hardware technology obviates the need for the separate locking mechanisms required by "soft" fastening systems.
Internally mounted bird or insect screens and safety rails can be readily integrated in the frame section of the louvre window.
For our frames, we exclusively use highly insulating, thermally broken multi-chambered sections with 24 mm adapter thickness. The sections can be adjusted to fit all standard stick-system assemblies, steel sections and rafter constructions. Packing for greater adapter thicknesses and the widening of the adapter edge are feasible.
Only filigree sections feature in Lacker's products. Depending on window size and structural requirements, the face widths generally range from 40 mm to 50 mm and the installation depths from 103 mm to 168 mm.
The frame sections are only visible from the inside and can be anodized or coated in any required RAL or DB colour.
All weatherstripping is made from ageing- and weather-resistant silicone or EPDM, with double-blade seal. Unlike standard brush seals, the weatherstripping materials and design guarantee full and reliable weather exclusion even after years of service.
We use state-of-the-art single-motor (230 V and 24 V) technology with intelligent controls that makes synchronization problems a thing of the past. This solution also significantly reduces current consumption, failure risks and the cross-sections needed for the power supply cables.
Protection is enhanced through vandal-proof installation of the motor and drive system in the frame section. The window's present (open/closed) position status can, depending on the system, be signalled by the motor.
The wiring for industrial communications networks (bus systems) or the central NSHEV station is integrated in the window and carried within the assembly to a single connection point.
As an optional extra, we supply our windows complete with cabling. Cable lengths vary from window to window and are adapted by us to meet project-specific requirements.
For indoor swimming pools and other damp or humid spaces, we install our watertight drive system with IP 67 rating. This offers exactly the same functions and benefits as our standard drives.
In all tests conducted by independent institutes, our bigAir® roof louvre windows exclusively deliver top results:
The Lacker Taifun – a special electromechanically controlled, hardware-independent four-point locking system – was purpose-designed for extreme applications in towers and high-rise buildings. It keeps windows absolutely weathertight, even under the severest wind loads of up to +4,000 Pa and -8,000 Pa. We are not aware of any other opening light worldwide that is able to withstand extreme storm conditions on this scale.