(19)

(11)

EP 2 909 541 A1

(12)

(43) Date of publication: 26.08.2015 Bulletin 2015/35 (21) Application number: 13837889.8 (22) Date of filing: 17.09.2013

(51) International Patent Classification (IPC):  F24F 13/12(2006.01) (86) International application number: PCT/SE2013/051084 (87) International publication number: WO 2014/042587 (20.03.2014 Gazette 2014/12)

(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 (30) Priority: 17.09.2012 SE 1251037 (71) Applicant: Swegon AB 535 23 Kvänum (SE)	(72) Inventors: SÖDERBERG, Tomas S-671 42 Arvika (SE) LARSSON, Per-Åke S-686 95 Västra Ämtervik (SE) (74) Representative: Bergquist, Kjell Gunnar  Westpatent AB Almekärrsvägen 11 443 39 Lerum 443 39 Lerum (SE)