Inward Opening Transom Awning Window. 3.2 mil Tempered Low E Double Pane Insulated Glass. R Value 3.8. U Value 0.265 with VLT of 61%. Fusion Welded PVC Frame. Frame PVC – will not warp, peel, corrode, Maintenance Free. 7/8 flange goes all around the window. 3″ window dept – 1″ From Front Frame to Flange and 2 From Flange to Back Frame. Rough Opening add 1/4″ to 1/2″ to window size. Other Sizes see our E-bay Store.