The Pella 150 Series XO sliding window measures 35.5"W x 47.5"H and features a durable white vinyl frame. The XO configuration includes one sliding vent panel and one fixed panel. Glazing is annealed glass with Low-E 180/Clear coating and high-altitude argon gas fill. NFRC and WDMA certified energy ratings: U-Factor 0.30, Solar Heat Gain Coefficient 0.53, Visible Transmittance 0.64. Item was pre-installed but never used; original labels and screen remain in place. Includes screen. No damage noted. Suitable for bedrooms, bathrooms, or any opening requiring a 36"x48" window with energy-efficient performance.