This publication discloses an electrostatic filter construction, to be positioned in air ducts or ventilation channels, which electrostatic filter construction includes a charging unit, which charges the particles to be filtered into a first electric potential and arranged in the filter construction in the path of the air flow before filter elements, electrically conducting electrodes connected to a second electric potential different to the potential of the charged particles and set substantially parallel to the direction of the airflow, and bag shaped filter elements positioned after the charging unit in the path of the air flow. According to the invention each bag shaped filter element has at least one designated UV-light source and an element of photo catalytic material like TiO2.Cette publication concerne une unité de filtre (47) pouvant être connectée à un dispositif de communication mobile (45) comprenant un ventilateur (51) pour générer un flux d'air (6) à l'intérieur de l'unité de filtre (47), des électrodes (14, 64, 68, 77) recouvertes d'un matériau photocatalytique comme le Ti02 dans le flux d'air (6), des DEL UV (16) éclairant les électrodes (64, 68, 77), et une sortie (6, 53, 66) pour le flux d'air dirigé dans la direction de l'utilisateur de l'unité de filtre (47).
