The Sea Thru Windows M2000 Foam Filled Frame Filling the vinyl extrusions with foam can increase the window's thermal efficiency by reducing the heat and cold transfer through the frame members. Features & Benefits: Fusion-welded frame and sash units are strong and weather tight. Interlocking meeting rail uses our new "Tri-Seal" system making your home more energy efficient. Mitered internal contoured glazing beads. Colonial or diamond grids available. Integra Latch System for slim tight lines and maximum glass area to let more light into your home Sloped sill for efficient water control. 3-1/4" deep jamb for no-mess easy replacement of existing wood windows. Available in European White and Tan. 3/4" glass with Intercept Warm Edge Space System. Night latches in top sash. Impact modified PVC profiles are designed for maximum thermal performance. Optional Low-E glass with argon or krypton gas for maximum thermal performance. Range of products - double-hungs, sliders, picture windows and hoppers. AAMA and NFRC test data available upon request. Tilt in top and bottom sash for easy cleaning.