Invitation to tender using restricted procedure, deadline 12.03.2012, for installation of ventilation and air conditioning system in 2.4 km of underground section of the ring rail line and station at Helsinki Vantaa airport. Contact Liikennevirasto, attn Maija Salonen, Helsinki, tel +358 206373834, e-mail etunimi.sukunimi@liikennevirasto.fi. Tenders to Liikennevirasto PL 33 (Opastinsilta 12 A, 2.krs), attn Kirjaamo Dnro 713/0820/2012, 00521 Helsinki. Visit http://ted.europa.eu/udl?request=Seek-Deliver&language=en&docid=060222-2012. 08/12.