Aluminum Double Glazed Bi Fold - *****2730
BI FOLD DOORS Double glazed at the cost of your standard Doors & Windows!! PLEASE NOTE: Image is for illustration purpose only. Door size in the picture may not be the actually size. New and improve bi fold doors have two glass panels on one frame with a gap in the middle which is filled with argon gas. This gas acts as an insulator and keeps the hot air out in summer and the cold air out in winter. The advantages of getting double glazed doors and windows are the following: