we are specialist in providing best solution for HVAC dcuting system, and give best support for our costumers. PHI factory is specializing in the manufacturing pre-insulated aluminium panel. Its a high-tech enterprise and is certified by the ISO. PHI pre-insulated aluminium panel have lots of excellent specifcation: our products could catch International standards meet the need of saving energy, Enviromental protection, we have catched class A in fire retardant,thermal conductivity: 0.018W/m.k, make our panel show excellent insulation spec., our product quality have proved in lots of projects and got good reputation.