Jinan Beirut ordered a good bridge aluminum doors and windows, air tightness: high-grade aluminum doors and windows have good air tightness, can give full play to air conditioning effect, energy saving 2, good insulation: high-grade aluminum windows and doors used intermediate profile insulator with low thermal conductivity, good insulation effect is much better than ordinary aluminum. 3, good impact resistance: both sides of the outer surface of the high-grade aluminum windows and doors are aluminum extrusions, wind pressure is good 4, sound good: high-grade aluminum alloy doors and windows of the structure has been carefully designed, tight joints, test results meet National A-level standards. 1, air tightness: high-grade aluminum alloy doors and windows have good air tightness, can give full play to air conditioning effect, saving energy 2, good insulation: thermal conductivity profiles intermediate insulator used in low-grade aluminum windows and doors, separated good thermal effect is much better than ordinary aluminum. 3, good impact resistance: both sides of the outer surface of the high-grade aluminum windows and doors are aluminum extrusions, wind pressure is good 4, sound good: high-grade aluminum alloy doors and windows of the structure has been carefully designed, tight joints, test results meet National A-level standards. Factory direct selling price, can be customized, models, cheap, large more favorable. Sincerely look forward to working with you! Company Website www.ltjaf.com Beirut Shandong Jinan Jia Security Engineering Co. ___ good bridge aluminum doors and custom Beirut