... 2.Good performance with the mulitiple functions aluminium louver window frames 1.Material:UPVC &PVC,Aluminum ,as per your requirement. ... ,2.0mm,so on10.Acoustical insulattion:31dB11.K-value of window:2.6w/m2.k12.Wind resistance:3700pa13.Air permeability:1 ... , Baisha CunDong street , HuangQi Town , Nanhai District ,Foshan City, China louver