(19)

(11)

EP 4 022 228 A1

(12)

(43) Date of publication: 06.07.2022 Bulletin 2022/27 (21) Application number: 20761234.2 (22) Date of filing: 24.08.2020

(51) International Patent Classification (IPC):  F24F 13/14(2006.01) F24F 13/04(2006.01) F24F 13/02(2006.01) (52) Cooperative Patent Classification (CPC): F24F 2221/36; F24F 13/14; F24F 13/0236; F24F 13/04 (86) International application number: PCT/EP2020/073650 (87) International publication number: WO 2021/037807 (04.03.2021 Gazette 2021/09)

(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: 30.08.2019 NL 2023734 (71) Applicant: Dutch Innovation in Air Treatment BV 7711 GG Nieuwleusen (NL)	(72) Inventors: TRIP, Vincent 7942 JR Meppel (NL) VAN DER LEE, Arthur 7942 JR Meppel (NL) (74) Representative: Cramwinckel, Michiel  Cramwinckel Consultancy Kallenkoterallee 82 A 8331 AJ Steenwijk 8331 AJ Steenwijk (NL)