(19)

(11)

EP 0 502 945 A1

(12)

(43) Date of publication: 16.09.1992 Bulletin 1992/38 (21) Application number: 91900391.0 (22) Date of filing: 23.11.1990

(51) International Patent Classification (IPC):  B01D 53/ 50( . ) F23J 15/ 00( . ) B01D 53/ 81( . ) (86) International application number: PCT/SE1990/000766 (87) International publication number: WO 1991/008042 (13.06.1991 Gazette 1991/13)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 05.12.1989 SE 19890004106 (71) Applicant: ABB FLÄKT AKTIEBOLAG S-120 86 Stockholm (SE)	(72) Inventors: BRINGFORS, Nils S-352 41 Växjö (SE) JOHANSSON, Lars-Erik S-352 50 Växjö (SE) AHMAN, Stefan S-352 42 Växjö (SE) (74) Representative: Dahlstrand, Björn  ABB FLÄKT AB S-120 86 Stockholm S-120 86 Stockholm (SE)