(19)

(11)

EP 0 444 079 A1

(12)

(43) Date of publication: 04.09.1991 Bulletin 1991/36 (21) Application number: 89912653.0 (22) Date of filing: 16.11.1989

(51) International Patent Classification (IPC):  B01L 1/ 04( . ) F24F 3/ 16( . ) (86) International application number: PCT/GB1989/001354 (87) International publication number: WO 1990/005549 (31.05.1990 Gazette 1990/12)

(84) Designated Contracting States: BE CH DE ES FR GB IT LI NL SE (30) Priority: 16.11.1988 GB 19880026827 (71) Applicant: ENVAIR LIMITED Lancashire BB4 4HX (GB)	(72) Inventor: BROMLEY, Graham Envair (UK) Limited York Avenue Lancashire BB4 4HX (GB) (74) Representative: Massey, Alexander, et al  MARKS & CLERK, Sussex House, 83-85 Mosley Street Manchester M2 3LG Manchester M2 3LG (GB)