1.The anti-aging, high strength 2.Corrosion resistance, long life 3.insulation 4.Energy saving 5.Sound insulation RS65 Double Leaf Outward-opening WindowFeature:1. Made of thermal break aluminum profile.2. Available in any sizes as per your needs.3. Simple and convenient operation, occupying small space, elegant in appearance.4. Good water tightness performance, air permeability performance, ...