White air ducts Blizzard R3 with silver formula. The new air distribution system Blizzard R2 based on white ducts is a continuation of the development of the "Green Series". Air ducts have improved antibacterial and antistatic characteristics. The new protected formula Silber Formel based on silver compounds provides high antibacterial qualities, which is confirmed by the German specialized laboratory QualityLabs BT GmbH, Neumeyerstraße 46a, 90411, Nürnberg.