(19)
(11) EP 1 663 406 A1

(12)

(43) Date of publication:
07.06.2006 Bulletin 2006/23

(21) Application number: 04775389.2

(22) Date of filing: 07.09.2004
(51) International Patent Classification (IPC): 
A62C 2/06(1990.01)
F24F 13/10(1968.09)
F16K 15/14(1968.09)
(86) International application number:
PCT/SE2004/001284
(87) International publication number:
WO 2005/023369 (17.03.2005 Gazette 2005/11)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

(30) Priority: 09.09.2003 SE 3022423

(71) Applicant: Fagergrens vvs Konsult ab
123 32 Farsta (SE)

(72) Inventor:
  • FAGERGREN, Tomas
    S-806 45 Gävle (SE)

(74) Representative: Larfeldt, Helene 
Bergensträhle & Lindvall AB P.O. Box 17704
118 93 Stockholm
118 93 Stockholm (SE)

   


(54) DEVICE FOR PREVENTING BACKFLOW IN VENTILATION DUCTS COMPRISED IN VENTILATION SYSTEMS