(19)

(11)

EP 0 900 336 A1

(12)

(43) Date of publication: 10.03.1999 Bulletin 1999/10 (21) Application number: 97924445.0 (22) Date of filing: 23.05.1997

(51) International Patent Classification (IPC):  F04D 29/ 28( . ) F04D 29/ 30( . ) (86) International application number: PCT/SE1997/000838 (87) International publication number: WO 1997/045643 (04.12.1997 Gazette 1997/52)

(84) Designated Contracting States: DE FR IT SE (30) Priority: 24.05.1996 SE 19960002002 (71) Applicant: ABB FLÄKT AKTIEBOLAG S-120 86 Stockholm (SE)	(72) Inventor: LONGET, Claude F-69003 Lyon (FR) (74) Representative: Rosenquist, Per Olof, et al  Bergenstrahle & Lindvall AB, P.O. Box 17704 118 93 Stockholm 118 93 Stockholm (SE)