... Corners'. We are a professional heat exchanger, air handing unit, heat pump,air cooler and air conditioner manufacturer in China ... of common materials of this Coil : 1.Fin plate: optical aluminum foil, hydrophilic aluminum foil, black hydrophilic aluminum foil and ... copper pipe with internal screws, purple copper-based optical tube and copper-nickel alloy tube;3.Connector pipe: purple copper pipe and ...