(19)

(11)

EP 0 932 801 A1

(12)

(43) Date of publication: 04.08.1999 Bulletin 1999/31 (21) Application number: 97944262.0 (22) Date of filing: 06.10.1997

(51) International Patent Classification (IPC):  F04D 29/ 42( . ) F24F 13/ 08( . ) (86) International application number: PCT/SE1997/001665 (87) International publication number: WO 1998/015785 (16.04.1998 Gazette 1998/15)

(84) Designated Contracting States: CH DE DK FI GB LI NL (30) Priority: 07.10.1996 SE 19960003640 (71) Applicant: ABB FLÄKT AKTIEBOLAG S-120 86 Stockholm (SE)	(72) Inventor: SJÖQVIST, Lennart S-564 34 Bankeryd (SE) (74) Representative: Siebmanns, Hubertus, et al  Götalands Patentbyra AB Box 154 561 22 Huskvarna 561 22 Huskvarna (SE)