(19)

(11)

EP 2 082 136 A1

(12)

(43) Date of publication: 29.07.2009 Bulletin 2009/31 (21) Application number: 07824850.7 (22) Date of filing: 16.10.2007

(51) International Patent Classification (IPC):  F04D 25/16(2006.01) F04D 29/42(2006.01) F04D 29/62(2006.01) F04D 27/02(2006.01) F04D 29/52(2006.01) (86) International application number: PCT/GB2007/050638 (87) International publication number: WO 2008/047162 (24.04.2008 Gazette 2008/17)

(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 LV MC MT NL PL PT RO SE SI SK TR (30) Priority: 17.10.2006 GB 0620500 (71) Applicant: Envirovent Limited Hornbeam Business Park Harrogate HG2 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)