(19)

(11)

EP 1 718 873 A1

(12)

(43) Date of publication: 08.11.2006 Bulletin 2006/45 (21) Application number: 05708221.6 (22) Date of filing: 28.01.2005

(51) International Patent Classification (IPC):  F04D 29/70(2006.01) F04D 27/02(2006.01) F04D 29/26(2006.01) F04D 29/42(2006.01) (86) International application number: PCT/GB2005/000307 (87) International publication number: WO 2005/073563 (11.08.2005 Gazette 2005/32)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR (30) Priority: 30.01.2004 GB 0402041 15.06.2004 GB 0413332 (71) Applicant: Farmer Controls Plc Envirovent House Hornbeam Business Park Harrogate HG 2 8PA (GB)	(72) Inventor: RUSSELL, Ronald, Kenneth Swindon SN3 5PN (GB) (74) Representative: Harrison Goddard Foote  Belgrave Hall Belgrave Street Leeds LS2 8DD Leeds LS2 8DD (GB)