heart of the doors and windows,;good;accessories are the biggest security for; doors and windows performance. QF keep tight cooperation with German;Siegenia-aubi, China KinLong,and so on.
4. Glass :;The U value of double;temper;glass is 1:1, can provide heat preservation and heat insulation, keep;comfortable environment; for cold and hot areas , energy saving rate was 50%.To enjoy high quality of life at the same time, also can save a lot of cost.
5.The;top 10 brands, guaranteed.;We;are the top 10 brand company,sale professional solutions.Our professional technical teams of doors and windows solve customer problems and customized; exclusively doors and windows system to the customers. After;you confirm the order,you don't need to worry about the rest of the thing ,we will make it all for you.

according to your requirement