(19)

(11)

EP 1 135 654 A1

(12)

(43) Date of publication: 26.09.2001 Bulletin 2001/39 (21) Application number: 99952715.3 (22) Date of filing: 05.11.1999

(51) International Patent Classification (IPC)7: F24D 19/08 (86) International application number: PCT/GB9903/671 (87) International publication number: WO 0034/718 (15.06.2000 Gazette 2000/24)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 05.12.1998 GB 9826719 (71) Applicant: Waldco Limited Biggin,North Yorkshire LS25 6HT (GB)	(72) Inventor: COLGAN, Alec Bramham,West Yorkshire LS23 6LH (GB) (74) Representative: Watson, Anthony Stephen et al 2 Lea CroftClifford Wetherby, LS23 6EY Wetherby, LS23 6EY (GB)