Vinyl basement window for new construction or replacement applications. Low "E" 1/2" insulated performance glass. Standard R-value 2.78, U-value .3597. Vinyl frame and sash fully welded, weatherstripped, and frame is weeped for water removal. Both sash are operable and removable. True interlocking sash with hook latch lock. Extruded vinyl masonary fin (strippable for replacement application). Full screen included. 5 year warranty on seal failure due to faulty manufacture. Warranty voided on installation above 6000' elevation.