Inward Opening Awning Style Window. PVC Frame, Glass – Double Pane Insulated Tempered Glass Low E. 3.2 mil Tempered Double Pane Glass. U Value 0.265 with a VLT of 61%. Fusion Welded PVC frame which will not warp, peel or corrode – maintenance free. Low-E is Triple-Silver MSVD which offers High VTL with Low Reflectance. Easy to install with screw/nail flange. 7/8 flange goes all around the window. Dept is 3″ – 1″ from front frame to flange, and 2 from flange to back frame. Two Sizes: 12″ x 12″ or 16″ x 16″. Rough opening needed add 1/4″ to 1/2″ more to window size.