This Pella 250 Series sliding window (OX configuration) measures 50"W x 42"H and features a white vinyl frame with dual-pane insulated glass, Low-E 180 coating, and argon gas fill rated for high-altitude performance — ideal for Denver installations. NFRC certified energy ratings: U-Factor 0.28, Solar Heat Gain Coefficient 0.51, Visible Transmittance 0.62. Includes a gray mesh screen and hardware bag. Center-mounted sash latch lock. One fixed panel, one operable sliding panel. In like-new condition with manufacturer labels and protective tape still in place. A top-performing energy-efficient window for replacement or new construction.
