Aluminum alloy window 1.stability &durability, 2.noise &heat resist,different designs, ... sid-hung doors, energy-saving doors, heatproof folding doors,WINDOWS:PVC sliding windows, aluminum alloy sliding windows, outside-hung windows, inside-hung ... , tempered glass etcwindows or doors casement material:PVC,aluminum alloy Performance parameters: 1) Sound insulation: RW≥28dB 2) Wind pressure resistance ...