Thanks to the DuoJetStream Technology (internal link) tobacco smoke will be collected and sucked in near the source with high efficiency – without drafts. The subsequent spark protection and the flow deflection make sure that no source of ignition is sucked in and the sound of the fan is reduced down to > 55 dB (a). The following fan is regulated in 3 stages and equipped with an energy-saving EC-motor. The exhaust emission of tobacco (ultra-fine particles, odours, harmful gas connections) will be filtered and retained in the 4-stages combifilter to nearly 100% so that the cleaned air can be fed with little energy, odourless and turbulence free back into the room.