1)       Window Frame Dimension and Installation Hole Dimension A4: 78*98 80*100 A6: 78*118 80*120 A8: 78*140 80*142 B6: 114*118 116*120 B8: 114*140 116*142

2)       Fit for roofing from 15 upto 90 degree

3)       Specially designed flashing of better function of sealing and waterproof

4)       Easily for installation of all AHRD accessories