Moving air has its own laws. The higher the volume and the higher the flow velocity, the more important optimum the geometry of the air duct is. Very large volumes of air (up to 650 cubic metres per hour with powerful hoods) should make their way to the outside with as little hindrance as possible.

Long ducts, the wrong material, unfavourable geometries, reduction of the cross section or sharp bends lead to stalls and pressure losses. With the result that the vapour is not extracted as effectively and the cleaning performance decreases. Noise and power consumption, on the other hand, increase.

In the patented air duct systems COMPAIR^® flow and COMPAIR^® bion, the air flows energy-efficiently and quietly around the bends. This is ensured by the optimally calculated radii of the pipe bends, a balanced ratio of height to width in the flat ducts and integrated guide vanes in adapter pieces and horizontal bends.