... hot air curtains 1,Centrifugal type,Natural wind and PTC heating wind dual application,CE GS approved.With plug,easy ... and deluxe design getting along well with the indoor decoration. 2, Casing made in aluminum alloy with plastic powder coating ... and maintenance. Elegant design without any screws. 3,PTC heating element is with safe non-conductive surface, overheatprotection,high efficiency,waterproof ...