(19)

(11)

EP 4 058 177 A1

(12)

(43) Date of publication: 21.09.2022 Bulletin 2022/38 (21) Application number: 20807900.4 (22) Date of filing: 10.11.2020

(51) International Patent Classification (IPC):  B01D 39/18(2006.01) B01D 46/24(2006.01) B01D 46/54(2006.01) F24F 3/14(2006.01) B01D 39/20(2006.01) B01D 53/26(2006.01) F26B 21/00(2006.01) (52) Cooperative Patent Classification (CPC): B01D 53/26; B01D 46/2414; B01D 2271/022; B01D 2271/025; B01D 39/18; B01D 39/2082; B01D 39/2065; B01D 2239/065; B01D 2239/025; B01D 53/263; B01D 53/266; F24F 8/108; F26B 21/003; B01D 46/64 (86) International application number: PCT/IB2020/060580 (87) International publication number: WO 2021/094922 (20.05.2021 Gazette 2021/20)

(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: 13.11.2019 IT 201900021123 (71) Applicant: Piovan S.P.A. 30036 Santa Maria di Sala (VE) (IT)	(72) Inventors: BELLIO, Enrico 31050 Ponzano Veneto (TV) (IT) BERTON, Luca 30035 Mirano (VE) (IT) (74) Representative: Villanova, Massimo et al Luppi Intellectual Property Srl Viale Corassori, 54 41124 Modena 41124 Modena (IT)