(19)

(11)

EP 0 670 749 A1

(12)

(43) Date of publication: 13.09.1995 Bulletin 1995/37 (21) Application number: 94901140.0 (22) Date of filing: 25.11.1993

(51) International Patent Classification (IPC):  B01D 46/ 00( . ) B01D 46/ 04( . ) (86) International application number: PCT/SE1993/001016 (87) International publication number: WO 1994/012264 (09.06.1994 Gazette 1994/13)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU NL PT SE (30) Priority: 26.11.1992 SE 19920003567 (71) Applicant: ABB FLÄKT AB S-131 34 Nacka (SE)	(72) Inventors: LINDAU, Leif S-352 51 Växjö (SE) WIKTORSSON, Anders S-352 53 Växjö (SE) (74) Representative: Dahlstrand, Björn  Asea Brown Boveri AB, Patent, Stockholm Office S-120 86 Stockholm S-120 86 Stockholm (SE)