(19)

(11)

EP 4 073 434 A1

(12)

(43) Date of publication: 19.10.2022 Bulletin 2022/42 (21) Application number: 20848842.9 (22) Date of filing: 14.12.2020

(51) International Patent Classification (IPC):  F24B 5/02(2006.01) F23N 3/00(2006.01) A61H 33/06(2006.01) F24B 1/02(2006.01) F23H 11/00(2006.01) (52) Cooperative Patent Classification (CPC): F24B 5/025; F24B 1/028; F23N 3/007; F23L 13/00; A61H 33/063 (86) International application number: PCT/FI2020/050838 (87) International publication number: WO 2021/116538 (17.06.2021 Gazette 2021/24)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 13.12.2019 FI 20196083 (71) Applicant: HARVIA FINLAND OY 40950 Muurame (FI)	(72) Inventor: HARJALUOMA, Pertti 40530 Jyväskylä (FI) (74) Representative: Kespat Oy  Vasarakatu 1 40320 Jyväskylä 40320 Jyväskylä (FI)