a filter device for the removal of suspended substances such as fat, volatile components and/or odoriferous substances from an air stream, in particular for use as a vapour extraction device under a cooking field (6),with a plasma filtration unit having a housing (11) in which an airway section is formed within which electrodes are arranged to produce a plasma, characterized by the fact that the housing (11) has a long cross section, in particular, has a longitudinal cross-section of rectangular or oval base shape which defines a longitudinal direction and a cross-direction of the housing (11), and that the housing (11) at its top has an air inlet (12) and has an air outlet at its underside or a lower end area in one of the two sides extending along the longitudinal direction (13).
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