... 2.secruity and durability style wngineered for school ,house ,factory Aluminium windows & doors ,curtain wall ,roller shutter,partition ,fixed ... Antifogging,AirtightWith so many good character,Xinjinda window and door can keep room clean,safe, sanitary, and be ... noise effectively.After surface processing, the window and door have strong weatherability, ageing resistance,and high corrosion resistance ...