TUBES : Bright Annealed Copper : 38” , ½ ” , 58” Wall ; Thk 0.4 - 0.55mm Aluminum Copper Fins , sine wave type 0.11mm - 0.4mm Chilled Hot Water ; Brine & Dx ( Refrigerant ), Steam Anti Corrosive Hydrophilic ; Blue , Gold , Red Frame : G.I. , S.S. , Al , Cu Header Pipes : G.I. M.S. S.S. Cu Hydraulic Mechanical Expansion OPTIONS Available with 3 - 6 pass PVC AL Steel Mist Easy Pull out roller based system MAX SINGLE SIZE 12 Row Deep