(19)

(11)

EP 3 077 623 A2

(12)

(88) Date of publication A3: 26.11.2015 (43) Date of publication: 12.10.2016 Bulletin 2016/41 (21) Application number: 14806664.0 (22) Date of filing: 05.12.2014

(51) International Patent Classification (IPC):  E21F 1/00(2006.01) (86) International application number: PCT/EP2014/076718 (87) International publication number: WO 2015/082684 (11.06.2015 Gazette 2015/23)

(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: 06.12.2013 NO 20131618 (71) Applicant: Tunnel Air Systems AS N-3184 Borre (NO)	(72) Inventor: Tunnel Air Systems AS N-3184 Borre (NO) (74) Representative: Oslo Patentkontor AS  P.O. Box 7007M 0306 Oslo 0306 Oslo (NO)